Merge pull request #686 from kubernetes-sigs/dependabot/go_modules/golang.org/x/crypto-0.31.0

build(deps): bump golang.org/x/crypto from 0.22.0 to 0.31.0

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,52 @@
+---
+name: Bug report
+about: Report a bug encountered while running prometheus-adapter
+title: ''
+labels: kind/bug
+assignees: ''
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!
+
+If the matter is security related, please disclose it privately see https://github.com/kubernetes/kube-state-metrics/blob/master/SECURITY.md
+-->
+
+**What happened?**:
+
+**What did you expect to happen?**:
+
+**Please provide the prometheus-adapter config**:
+<details open>
+<summary>prometheus-adapter config</summary>
+
+<!--- INSERT config HERE --->
+
+</details>
+
+**Please provide the HPA resource used for autoscaling**:
+<details open>
+<summary>HPA yaml</summary>
+
+<!--- INSERT yaml HERE --->
+
+</details>
+
+**Please provide the HPA status**:
+
+**Please provide the prometheus-adapter logs with -v=6 around the time the issue happened**:
+<details open>
+<summary>prometheus-adapter logs</summary>
+
+<!--- INSERT logs HERE --->
+
+</details>
+
+**Anything else we need to know?**:
+
+**Environment**:
+- prometheus-adapter version: 
+- prometheus version: 
+- Kubernetes version (use `kubectl version`):
+- Cloud provider or hardware configuration:
+- Other info:

.gitignore

@@ -1,4 +1,5 @@
 *.swp
 *~
-vendor
-_output
+/vendor
+/adapter
+.e2e

.golangci.yml

@@ -0,0 +1,39 @@
+run:
+  deadline: 5m
+
+linters:
+  disable-all: true
+  enable:
+    - bodyclose
+    - dogsled
+    - dupl
+    - errcheck
+    - exportloopref
+    - gocritic
+    - gocyclo
+    - gofmt
+    - goimports
+    - gosec
+    - goprintffuncname
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - nakedret
+    - nolintlint
+    - revive
+    - staticcheck
+    - stylecheck
+    - typecheck
+    - unconvert
+    - unused
+    - whitespace
+
+linters-settings:
+  goimports:
+    local-prefixes: sigs.k8s.io/prometheus-adapter
+  revive:
+    rules:
+      - name: exported
+        arguments:
+          - disableStutteringCheck

.travis.yml

@@ -1,23 +0,0 @@
-language: go
-
-go:
-- 1.8
-
-# blech, Travis downloads with capitals in DirectXMan12, which confuses go
-go_import_path: github.com/directxman12/k8s-prometheus-adapter
-
-addons:
-  apt:
-    sources:
-    - sourceline: 'ppa:masterminds/glide'
-    packages:
-    - glide
-
-install:
-- make -B vendor
-
-script: make verify
-
-cache:
-  directories:
-  - ~/.glide

CONTRIBUTING.md

@@ -0,0 +1,31 @@
+# Contributing Guidelines
+
+Welcome to Kubernetes. We are excited about the prospect of you joining our [community](https://git.k8s.io/community)! The Kubernetes community abides by the CNCF [code of conduct](code-of-conduct.md). Here is an excerpt:
+
+_As contributors and maintainers of this project, and in the interest of fostering an open and welcoming community, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities._
+
+## Getting Started
+
+We have full documentation on how to get started contributing here:
+
+<!---
+If your repo has certain guidelines for contribution, put them here ahead of the general k8s resources
+-->
+
+- [Contributor License Agreement](https://git.k8s.io/community/CLA.md) Kubernetes projects require that you sign a Contributor License Agreement (CLA) before we can accept your pull requests
+- [Kubernetes Contributor Guide](https://git.k8s.io/community/contributors/guide) - Main contributor documentation, or you can just jump directly to the [contributing section](https://git.k8s.io/community/contributors/guide#contributing)
+- [Contributor Cheat Sheet](https://git.k8s.io/community/contributors/guide/contributor-cheatsheet) - Common resources for existing developers
+
+## Mentorship
+
+- [Mentoring Initiatives](https://git.k8s.io/community/mentoring) - We have a diverse set of mentorship programs available that are always looking for volunteers!
+
+<!---
+Custom Information - if you're copying this template for the first time you can add custom content here, for example:
+
+## Contact Information
+
+- [Slack channel](https://kubernetes.slack.com/messages/kubernetes-users) - Replace `kubernetes-users` with your slack channel string, this will send users directly to your channel. 
+- [Mailing list](URL)
+
+-->

Dockerfile

@@ -0,0 +1,22 @@
+ARG ARCH
+ARG GO_VERSION
+
+FROM golang:${GO_VERSION} as build
+
+WORKDIR /go/src/sigs.k8s.io/prometheus-adapter
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+COPY pkg pkg
+COPY cmd cmd
+COPY Makefile Makefile
+
+ARG ARCH
+RUN make prometheus-adapter
+
+FROM gcr.io/distroless/static:latest-$ARCH
+
+COPY --from=build /go/src/sigs.k8s.io/prometheus-adapter/adapter /
+USER 65534
+ENTRYPOINT ["/adapter"]

LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "{}"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright {yyyy} {name of copyright owner}
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

Makefile

@@ -1,73 +1,118 @@
-REGISTRY?=directxman12
-IMAGE?=k8s-prometheus-adapter
-TEMP_DIR:=$(shell mktemp -d)
-ARCH?=amd64
+REGISTRY?=gcr.io/k8s-staging-prometheus-adapter
+IMAGE=prometheus-adapter
+ARCH?=$(shell go env GOARCH)
 ALL_ARCH=amd64 arm arm64 ppc64le s390x
-ML_PLATFORMS=linux/amd64,linux/arm,linux/arm64,linux/ppc64le,linux/s390x
-OUT_DIR?=./_output
-VENDOR_DOCKERIZED=0
+GOPATH:=$(shell go env GOPATH)
 
-VERSION?=latest
+VERSION=$(shell cat VERSION)
+TAG_PREFIX=v
+TAG?=$(TAG_PREFIX)$(VERSION)
 
-ifeq ($(ARCH),amd64)
-	BASEIMAGE?=busybox
-endif
-ifeq ($(ARCH),arm)
-	BASEIMAGE?=armhf/busybox
-endif
-ifeq ($(ARCH),arm64)
-	BASEIMAGE?=aarch64/busybox
-endif
-ifeq ($(ARCH),ppc64le)
-	BASEIMAGE?=ppc64le/busybox
-endif
-ifeq ($(ARCH),s390x)
-	BASEIMAGE?=s390x/busybox
+GO_VERSION?=1.22.5
+GOLANGCI_VERSION?=1.56.2
+
+.PHONY: all
+all: prometheus-adapter
+
+# Build
+# -----
+
+SRC_DEPS=$(shell find pkg cmd -type f -name "*.go")
+
+prometheus-adapter: $(SRC_DEPS)
+	CGO_ENABLED=0 GOARCH=$(ARCH) go build sigs.k8s.io/prometheus-adapter/cmd/adapter
+
+.PHONY: container
+container:
+	docker build -t $(REGISTRY)/$(IMAGE)-$(ARCH):$(TAG) --build-arg ARCH=$(ARCH) --build-arg GO_VERSION=$(GO_VERSION) .
+
+# Container push
+# --------------
+
+PUSH_ARCH_TARGETS=$(addprefix push-,$(ALL_ARCH))
+
+.PHONY: push
+push: container
+	docker push $(REGISTRY)/$(IMAGE)-$(ARCH):$(TAG)
+
+push-all: $(PUSH_ARCH_TARGETS) push-multi-arch;
+
+.PHONY: $(PUSH_ARCH_TARGETS)
+$(PUSH_ARCH_TARGETS): push-%:
+	ARCH=$* $(MAKE) push
+
+.PHONY: push-multi-arch
+push-multi-arch: export DOCKER_CLI_EXPERIMENTAL = enabled
+push-multi-arch:
+	docker manifest create --amend $(REGISTRY)/$(IMAGE):$(TAG) $(shell echo $(ALL_ARCH) | sed -e "s~[^ ]*~$(REGISTRY)/$(IMAGE)\-&:$(TAG)~g")
+	@for arch in $(ALL_ARCH); do docker manifest annotate --arch $${arch} $(REGISTRY)/$(IMAGE):$(TAG) $(REGISTRY)/$(IMAGE)-$${arch}:$(TAG); done
+	docker manifest push --purge $(REGISTRY)/$(IMAGE):$(TAG)
+
+# Test
+# ----
+
+.PHONY: test
+test:
+	CGO_ENABLED=0 go test ./cmd/... ./pkg/...
+
+.PHONY: test-e2e
+test-e2e:
+	./test/run-e2e-tests.sh
+
+
+# Static analysis
+# ---------------
+
+.PHONY: verify
+verify: verify-lint verify-deps verify-generated
+
+.PHONY: update
+update: update-lint update-generated
+
+# Format and lint
+# ---------------
+
+HAS_GOLANGCI_VERSION:=$(shell $(GOPATH)/bin/golangci-lint version --format=short)
+.PHONY: golangci
+golangci:
+ifneq ($(HAS_GOLANGCI_VERSION), $(GOLANGCI_VERSION))
+	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOPATH)/bin v$(GOLANGCI_VERSION)
 endif
 
-.PHONY: all build docker-build push-% push test verify-gofmt gofmt verify
+.PHONY: verify-lint
+verify-lint: golangci
+	$(GOPATH)/bin/golangci-lint run --modules-download-mode=readonly || (echo 'Run "make update-lint"' && exit 1)
 
-all: build
-build: vendor
-	CGO_ENABLED=0 GOARCH=$(ARCH) go build -a -tags netgo -o $(OUT_DIR)/$(ARCH)/adapter github.com/directxman12/k8s-prometheus-adapter/cmd/adapter
+.PHONY: update-lint
+update-lint: golangci
+	$(GOPATH)/bin/golangci-lint run --fix --modules-download-mode=readonly
 
-docker-build: vendor
-	cp deploy/Dockerfile $(TEMP_DIR)
-	cd $(TEMP_DIR) && sed -i "s|BASEIMAGE|$(BASEIMAGE)|g" Dockerfile
 
-	docker run -it -v $(TEMP_DIR):/build -v $(shell pwd):/go/src/github.com/directxman12/k8s-prometheus-adapter -e GOARCH=$(ARCH) golang:1.8 /bin/bash -c "\
-		CGO_ENABLED=0 go build -a -tags netgo -o /build/adapter github.com/directxman12/k8s-prometheus-adapter/cmd/adapter"
+# Dependencies
+# ------------
 
-	docker build -t $(REGISTRY)/$(IMAGE)-$(ARCH):$(VERSION) $(TEMP_DIR)
-	sudo rm -r $(TEMP_DIR)
+.PHONY: verify-deps
+verify-deps:
+	go mod verify
+	go mod tidy
+	@git diff --exit-code -- go.mod go.sum
 
-push-%:
-	$(MAKE) ARCH=$* docker-build
-	docker push $(REGISTRY)/$(IMAGE)-$*:$(VERSION)
+# Generation
+# ----------
 
-push: ./manifest-tool $(addprefix push-,$(ALL_ARCH))
-	./manifest-tool push from-args --platforms $(ML_PLATFORMS) --template $(REGISTRY)/$(IMAGE)-ARCH:$(VERSION) --target $(REGISTRY)/$(IMAGE):$(VERSION)
+generated_files=pkg/api/generated/openapi/zz_generated.openapi.go
 
-./manifest-tool:
-	curl -sSL https://github.com/estesp/manifest-tool/releases/download/v0.5.0/manifest-tool-linux-amd64 > manifest-tool
-	chmod +x manifest-tool
+.PHONY: verify-generated
+verify-generated: update-generated
+	@git diff --exit-code -- $(generated_files)
 
-vendor: glide.lock
-ifeq ($(VENDOR_DOCKERIZED),1)
-	docker run -it -v $(shell pwd):/go/src/github.com/directxman12/k8s-prometheus-adapter -w /go/src/github.com/directxman12/k8s-prometheus-adapter golang:1.8 /bin/bash -c "\
-		curl https://glide.sh/get | sh \
-		&& glide install -v"
-else
-	glide install -v
-endif
-
-test: vendor
-	CGO_ENABLED=0 go test ./pkg/...
-
-verify-gofmt:
-	./hack/gofmt-all.sh -v
-
-gofmt:
-	./hack/gofmt-all.sh
-
-verify: verify-gofmt test
+.PHONY: update-generated
+update-generated:
+	go install -mod=readonly k8s.io/kube-openapi/cmd/openapi-gen
+	$(GOPATH)/bin/openapi-gen --logtostderr \
+		--go-header-file ./hack/boilerplate.go.txt \
+		--output-pkg ./pkg/api/generated/openapi \
+		--output-file zz_generated.openapi.go \
+		--output-dir ./pkg/api/generated/openapi \
+		-r /dev/null \
+		"k8s.io/metrics/pkg/apis/custom_metrics" "k8s.io/metrics/pkg/apis/custom_metrics/v1beta1" "k8s.io/metrics/pkg/apis/custom_metrics/v1beta2" "k8s.io/metrics/pkg/apis/external_metrics" "k8s.io/metrics/pkg/apis/external_metrics/v1beta1" "k8s.io/metrics/pkg/apis/metrics" "k8s.io/metrics/pkg/apis/metrics/v1beta1" "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/api/resource" "k8s.io/apimachinery/pkg/version" "k8s.io/api/core/v1"

NOTICE

@@ -0,0 +1,16 @@
+When donating the k8s-prometheus-adapter project to the CNCF, we could not
+reach all the contributors to make them sign the CNCF CLA. As such, according
+to the CNCF rules to donate a repository, we must add a NOTICE referencing
+section 7 of the CLA with a list of developers who could not be reached.
+
+`7. Should You wish to submit work that is not Your original creation, You may
+submit it to the Foundation separately from any Contribution, identifying the
+complete details of its source and of any license or other restriction
+(including, but not limited to, related patents, trademarks, and license
+agreements) of which you are personally aware, and conspicuously marking the
+work as "Submitted on behalf of a third-party: [named here]".`
+
+Submitted on behalf of a third-party: Andrew "thisisamurray" Murray
+Submitted on behalf of a third-party: Duane "duane-ibm" D'Souza
+Submitted on behalf of a third-party: John "john-delivuk" Delivuk
+Submitted on behalf of a third-party: Richard "rrtaylor" Taylor

OWNERS

@@ -0,0 +1,17 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+approvers:
+  - dgrisonnet
+  - logicalhan
+  - dashpole
+
+reviewers:
+  - dgrisonnet
+  - olivierlemasle
+  - logicalhan
+  - dashpole
+
+emeritus_approvers:
+- brancz
+- directxman12
+- lilic
+- s-urbaniak

README.md

@@ -1,11 +1,44 @@
-Kubernetes Custom Metrics Adapter for Prometheus
-================================================
+# Prometheus Adapter for Kubernetes Metrics APIs
 
-This repository contains an implementation of the Kubernetes custom
-metrics API
-([custom-metrics.metrics.k8s.io/v1alpha1](https://github.com/kubernetes/metrics/tree/master/pkg/apis/custom_metrics)),
-suitable for use with the autoscaling/v2 Horizontal Pod Autoscaler in
-Kubernetes 1.6+.
+This repository contains an implementation of the Kubernetes Custom, Resource and External
+[Metric APIs](https://github.com/kubernetes/metrics).
+
+This adapter is therefore suitable for use with the autoscaling/v2 Horizontal Pod Autoscaler in Kubernetes 1.6+.  
+It can also replace the [metrics server](https://github.com/kubernetes-incubator/metrics-server) on clusters that already run Prometheus and collect the appropriate metrics.
+
+Quick Links
+-----------
+
+- [Config walkthrough](docs/config-walkthrough.md) and [config reference](docs/config.md).
+- [End-to-end walkthrough](docs/walkthrough.md)
+- [Deployment info and files](deploy/README.md)
+
+Installation
+-------------
+If you're a helm user, a helm chart is listed on prometheus-community repository as [prometheus-community/prometheus-adapter](https://github.com/prometheus-community/helm-charts/tree/main/charts/prometheus-adapter).
+
+To install it with the release name `my-release`, run this Helm command:
+
+For Helm2
+```console
+$ helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+$ helm repo update
+$ helm install --name my-release prometheus-community/prometheus-adapter
+```
+For Helm3 ( as name is mandatory )
+```console
+$ helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+$ helm repo update
+$ helm install my-release prometheus-community/prometheus-adapter
+```
+
+Official images
+---
+All official images for releases after v0.8.4 are available in `registry.k8s.io/prometheus-adapter/prometheus-adapter:$VERSION`. The project also maintains a [staging registry](https://console.cloud.google.com/gcr/images/k8s-staging-prometheus-adapter/GLOBAL/) where images for each commit from the master branch are published. You can use this registry if you need to test a version from a specific commit, or if you need to deploy a patch while waiting for a new release.
+
+Images for versions v0.8.4 and prior are only available in unofficial registries:
+* https://quay.io/repository/coreos/k8s-prometheus-adapter-amd64
+* https://hub.docker.com/r/directxman12/k8s-prometheus-adapter/
 
 Configuration
 -------------
@@ -16,7 +49,7 @@ will attempt to using [Kubernetes in-cluster
 config](https://kubernetes.io/docs/tasks/access-application-cluster/access-cluster/#accessing-the-api-from-a-pod)
 to connect to the cluster.
 
-It takes the following addition arguments specific to configuring how the
+It takes the following additional arguments specific to configuring how the
 adapter talks to Prometheus and the main Kubernetes cluster:
 
 - `--lister-kubeconfig=<path-to-kubeconfig>`: This configures
@@ -25,34 +58,50 @@ adapter talks to Prometheus and the main Kubernetes cluster:
   in-cluster config.
 
 - `--metrics-relist-interval=<duration>`: This is the interval at which to
-  update the cache of available metrics from Prometheus.
+  update the cache of available metrics from Prometheus. By default, this
+  value is set to 10 minutes.
 
-- `--rate-interval=<duration>`: This is the duration used when requesting
-  rate metrics from Prometheus.  It *must* be larger than your Prometheus
-  collection interval.
+- `--metrics-max-age=<duration>`: This is the max age of the metrics to be
+  loaded from Prometheus. For example, when set to `10m`, it will query
+  Prometheus for metrics since 10m ago, and only those that has datapoints
+  within the time period will appear in the adapter. Therefore, the metrics-max-age
+  should be equal to or larger than your Prometheus' scrape interval,
+  or your metrics will occaisonally disappear from the adapter.
+  By default, this is set to be the same as metrics-relist-interval to avoid
+  some confusing behavior (See this [PR](https://github.com/kubernetes-sigs/prometheus-adapter/pull/230)).
+
+  Note: We recommend setting this only if you understand what is happening.
+  For example, this setting could be useful in cases where the scrape duration is
+  over a network call, e.g. pulling metrics from AWS CloudWatch, or Google Monitoring,
+  more specifically, Google Monitoring sometimes have delays on when data will show
+  up in their system after being sampled. This means that even if you scraped data
+  frequently, they might not show up soon. If you configured the relist interval to
+  a short period but without configuring this, you might not be able to see your
+  metrics in the adapter in certain scenarios.
 
 - `--prometheus-url=<url>`: This is the URL used to connect to Prometheus.
   It will eventually contain query parameters to configure the connection.
 
+- `--config=<yaml-file>` (`-c`): This configures how the adapter discovers available
+  Prometheus metrics and the associated Kubernetes resources, and how it presents those
+  metrics in the custom metrics API.  More information about this file can be found in
+  [docs/config.md](docs/config.md).
+
 Presentation
 ------------
 
 The adapter gathers the names of available metrics from Prometheus
-a regular interval (see [Configuration](#configuration) above), and then
+at a regular interval (see [Configuration](#configuration) above), and then
 only exposes metrics that follow specific forms.
 
-In general:
+The rules governing this discovery are specified in a [configuration file](docs/config.md).
+If you were relying on the implicit rules from the previous version of the adapter,
+you can use the included `config-gen` tool to generate a configuration that matches
+the old implicit ruleset:
 
-- Metrics must have the `namespace` label to be considered.
-
-- For each label on a metric, if that label name corresponds to
-  a Kubernetes resource (like `pod` or `service`), the metric will be
-  associated with that resource.
-
-- Metrics ending in `_total` are assumed to be cumulative, and will be
-  exposed without the suffix as a rate metric.
-
-Detailed information can be found under [docs/format.md](docs/format.md).
+```shell
+$ go run cmd/config-gen/main.go [--rate-interval=<duration>] [--label-prefix=<prefix>]
+```
 
 Example
 -------
@@ -63,7 +112,8 @@ Additionally, [@luxas](https://github.com/luxas) has an excellent example
 deployment of Prometheus, this adapter, and a demo pod which serves
 a metric `http_requests_total`, which becomes the custom metrics API
 metric `pods/http_requests`.  It also autoscales on that metric using the
-`autoscaling/v2alpha1` HorizontalPodAutoscaler.
+`autoscaling/v2beta1` HorizontalPodAutoscaler.  Note that @luxas's tutorial
+uses a slightly older version of the adapter.
 
 It can be found at https://github.com/luxas/kubeadm-workshop.  Pay special
 attention to:
@@ -72,3 +122,110 @@ attention to:
   Operator](https://github.com/luxas/kubeadm-workshop#deploying-the-prometheus-operator-for-monitoring-services-in-the-cluster)
 - [Setting up the custom metrics adapter and sample
   app](https://github.com/luxas/kubeadm-workshop#deploying-a-custom-metrics-api-server-and-a-sample-app)
+
+FAQs
+----
+
+### Why do my metrics keep jumping between a normal value and a very large number?
+
+You're probably switching between whole numbers (e.g. `10`) and milli-quantities (e.g. `10500m`).
+Worry not!  This is just how Kubernetes represents fractional values.  See the
+[Quantity Values](/docs/walkthrough.md#quantity-values) section of the walkthrough for a bit more
+information.
+
+### Why isn't my metric showing up?
+
+First, check your configuration.  Does it select your metric?  You can
+find the [default configuration](/deploy/manifests/custom-metrics-config-map.yaml)
+in the deploy directory, and more information about configuring the
+adapter in the [docs](/docs/config.md).
+
+Next, check if the discovery information looks right.  You should see the
+metrics showing up as associated with the resources you expect at
+`/apis/custom.metrics.k8s.io/v1beta1/` (you can use `kubectl get --raw
+/apis/custom.metrics.k8s.io/v1beta1` to check, and can pipe to `jq` to
+pretty-print the results, if you have it installed). If not, make sure
+your series are labeled correctly.  Consumers of the custom metrics API
+(especially the HPA) don't do any special logic to associate a particular
+resource to a particular series, so you have to make sure that the adapter
+does it instead.
+
+For example, if you want a series `foo` to be associated with deployment
+`bar` in namespace `somens`, make sure there's some label that represents
+deployment name, and that the adapter is configured to use it.  With the
+default config, that means you'd need the query
+`foo{namespace="somens",deployment="bar"}` to return some results in
+Prometheus.
+
+Next, try using the `--v=6` flag on the adapter to see the exact queries
+being made by the adapter.  Try url-decoding the query and pasting it into
+the Prometheus web console to see if the query looks wrong.
+
+### My query contains multiple metrics, how do I make that work?
+
+It's actually fairly straightforward, if a bit non-obvious.  Simply choose one
+metric to act as the "discovery" and "naming" metric, and use that to configure
+the "discovery" and "naming" parts of the configuration.  Then, you can write
+whichever metrics you want in the `metricsQuery`!  The series query can contain
+whichever metrics you want, as long as they have the right set of labels.
+
+For example, suppose you have two metrics `foo_total` and `foo_count`,
+both with the label `system_name`, which represents the `node` resource.
+Then, you might write
+
+```yaml
+rules:
+- seriesQuery: 'foo_total'
+  resources: {overrides: {system_name: {resource: "node"}}}
+  name:
+    matches: 'foo_total'
+    as: 'foo'
+  metricsQuery: 'sum(foo_total{<<.LabelMatchers>>}) by (<<.GroupBy>>) / sum(foo_count{<<.LabelMatchers>>}) by (<<.GroupBy>>)'
+```
+
+### I get errors about SubjectAccessReviews/system:anonymous/TLS/Certificates/RequestHeader!
+
+It's important to understand the role of TLS in the Kubernetes cluster.  There's a high-level
+overview here: https://github.com/kubernetes-incubator/apiserver-builder/blob/master/docs/concepts/auth.md.
+
+All of the above errors generally boil down to misconfigured certificates.
+Specifically, you'll need to make sure your cluster's aggregation layer is
+properly configured, with requestheader certificates set up properly.
+
+Errors about SubjectAccessReviews failing for system:anonymous generally mean
+that your cluster's given requestheader CA doesn't trust the proxy certificates
+from the API server aggregator.
+
+On the other hand, if you get an error from the aggregator about invalid certificates,
+it's probably because the CA specified in the `caBundle` field of your APIService
+object doesn't trust the serving certificates for the adapter.
+
+If you're seeing SubjectAccessReviews failures for non-anonymous users, check your
+RBAC rules -- you probably haven't given users permission to operate on resources in
+the `custom.metrics.k8s.io` API group.
+
+### My metrics appear and disappear
+
+You probably have a Prometheus collection interval or computation interval
+that's larger than your adapter's discovery interval.  If the metrics
+appear in discovery but occaisionally return not-found, those intervals
+are probably larger than one of the rate windows used in one of your
+queries.  The adapter only considers metrics with datapoints in the window
+`[now-discoveryInterval, now]` (in order to only capture metrics that are
+still present), so make sure that your discovery interval is at least as
+large as your collection interval.
+
+### I get errors when query namespace prefixed metrics?
+
+I have namespace prefixed metrics like `{ "name": "namespaces/node_memory_PageTables_bytes", "singularName": "", "namespaced": false, "kind": "MetricValueList", "verbs": [ "get" ] }`, but I get error `Error from server (InternalError): Internal error occurred: unable to list matching resources` when access with `kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1/namespaces/*/node_memory_PageTables_bytes` .
+
+Actually namespace prefixed metrics are special, we should access them with `kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1/namespaces/*/metrics/node_memory_PageTables_bytes`.
+
+## Community, discussion, contribution, and support
+
+Learn how to engage with the Kubernetes community on the [community page](http://kubernetes.io/community/).
+
+You can reach the maintainers of this project at:
+
+- [Slack](http://slack.k8s.io/)
+- [Mailing List](https://groups.google.com/forum/#!forum/kubernetes-dev)

RELEASE.md

@@ -0,0 +1,13 @@
+# Release Process
+
+prometheus-adapter is released on an as-needed basis. The process is as follows:
+
+1. An issue is proposing a new release with a changelog since the last release
+1. At least one [OWNERS](OWNERS) must LGTM this release
+1. A PR that bumps version hardcoded in code is created and merged
+1. An OWNER creates a draft Github release
+1. An OWNER creates a release tag using `git tag -s $VERSION`, inserts the changelog and pushes the tag with `git push $VERSION`. Then waits for [prow.k8s.io](https://prow.k8s.io) to build and push new images to [gcr.io/k8s-staging-prometheus-adapter](https://gcr.io/k8s-staging-prometheus-adapter)
+1. A PR in [kubernetes/k8s.io](https://github.com/kubernetes/k8s.io/blob/main/k8s.gcr.io/images/k8s-staging-prometheus-adapter/images.yaml) is created to release images to `k8s.gcr.io`
+1. An OWNER publishes the GitHub release
+1. An announcement email is sent to `kubernetes-sig-instrumentation@googlegroups.com` with the subject `[ANNOUNCE] prometheus-adapter $VERSION is released`
+1. The release issue is closed

SECURITY.md

@@ -0,0 +1,22 @@
+# Security Policy
+
+## Security Announcements
+
+Join the [kubernetes-security-announce] group for security and vulnerability announcements.
+
+You can also subscribe to an RSS feed of the above using [this link][kubernetes-security-announce-rss].
+
+## Reporting a Vulnerability
+
+Instructions for reporting a vulnerability can be found on the
+[Kubernetes Security and Disclosure Information] page.
+
+## Supported Versions
+
+Information about supported Kubernetes versions can be found on the
+[Kubernetes version and version skew support policy] page on the Kubernetes website.
+
+[kubernetes-security-announce]: https://groups.google.com/forum/#!forum/kubernetes-security-announce
+[kubernetes-security-announce-rss]: https://groups.google.com/forum/feed/kubernetes-security-announce/msgs/rss_v2_0.xml?num=50
+[Kubernetes version and version skew support policy]: https://kubernetes.io/docs/setup/release/version-skew-policy/#supported-versions
+[Kubernetes Security and Disclosure Information]: https://kubernetes.io/docs/reference/issues-security/security/#report-a-vulnerability

SECURITY_CONTACTS

@@ -0,0 +1,14 @@
+# Defined below are the security contacts for this repo.
+#
+# They are the contact point for the Product Security Committee to reach out
+# to for triaging and handling of incoming issues.
+#
+# The below names agree to abide by the
+# [Embargo Policy](https://git.k8s.io/security/private-distributors-list.md#embargo-policy)
+# and will be removed and replaced if they violate that agreement.
+#
+# DO NOT REPORT SECURITY VULNERABILITIES DIRECTLY TO THESE NAMES, FOLLOW THE
+# INSTRUCTIONS AT https://kubernetes.io/security/
+
+dgrisonnet
+s-urbaniak

VERSION

@@ -0,0 +1 @@
+0.12.0

cloudbuild.yaml

@@ -0,0 +1,11 @@
+# See https://cloud.google.com/cloud-build/docs/build-config                                            
+timeout: 3600s
+options:
+  substitution_option: ALLOW_LOOSE
+steps:
+  - name: 'gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20211118-2f2d816b90'
+    entrypoint: make
+    env:
+    - TAG=$_PULL_BASE_REF
+    args:
+    - push-all

cmd/adapter/adapter.go

@@ -17,27 +17,454 @@ limitations under the License.
 package main
 
 import (
-	"flag"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"net/http"
+	"net/url"
 	"os"
-	"runtime"
+	"strings"
+	"time"
 
-	"k8s.io/apimachinery/pkg/util/wait"
-	"k8s.io/apiserver/pkg/util/logs"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	openapinamer "k8s.io/apiserver/pkg/endpoints/openapi"
+	genericapiserver "k8s.io/apiserver/pkg/server"
+	"k8s.io/client-go/metadata"
+	"k8s.io/client-go/metadata/metadatainformer"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/client-go/transport"
+	"k8s.io/component-base/logs"
+	"k8s.io/klog/v2"
 
-	"github.com/directxman12/k8s-prometheus-adapter/cmd/adapter/app"
+	customexternalmetrics "sigs.k8s.io/custom-metrics-apiserver/pkg/apiserver"
+	basecmd "sigs.k8s.io/custom-metrics-apiserver/pkg/cmd"
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+	"sigs.k8s.io/metrics-server/pkg/api"
+
+	generatedopenapi "sigs.k8s.io/prometheus-adapter/pkg/api/generated/openapi"
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	mprom "sigs.k8s.io/prometheus-adapter/pkg/client/metrics"
+	adaptercfg "sigs.k8s.io/prometheus-adapter/pkg/config"
+	cmprov "sigs.k8s.io/prometheus-adapter/pkg/custom-provider"
+	extprov "sigs.k8s.io/prometheus-adapter/pkg/external-provider"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
+	resprov "sigs.k8s.io/prometheus-adapter/pkg/resourceprovider"
 )
 
+type PrometheusAdapter struct {
+	basecmd.AdapterBase
+
+	// PrometheusURL is the URL describing how to connect to Prometheus.  Query parameters configure connection options.
+	PrometheusURL string
+	// PrometheusAuthInCluster enables using the auth details from the in-cluster kubeconfig to connect to Prometheus
+	PrometheusAuthInCluster bool
+	// PrometheusAuthConf is the kubeconfig file that contains auth details used to connect to Prometheus
+	PrometheusAuthConf string
+	// PrometheusCAFile points to the file containing the ca-root for connecting with Prometheus
+	PrometheusCAFile string
+	// PrometheusClientTLSCertFile points to the file containing the client TLS cert for connecting with Prometheus
+	PrometheusClientTLSCertFile string
+	// PrometheusClientTLSKeyFile points to the file containing the client TLS key for connecting with Prometheus
+	PrometheusClientTLSKeyFile string
+	// PrometheusTokenFile points to the file that contains the bearer token when connecting with Prometheus
+	PrometheusTokenFile string
+	// PrometheusHeaders is a k=v list of headers to set on requests to PrometheusURL
+	PrometheusHeaders []string
+	// PrometheusVerb is a verb to set on requests to PrometheusURL
+	PrometheusVerb string
+	// AdapterConfigFile points to the file containing the metrics discovery configuration.
+	AdapterConfigFile string
+	// MetricsRelistInterval is the interval at which to relist the set of available metrics
+	MetricsRelistInterval time.Duration
+	// MetricsMaxAge is the period to query available metrics for
+	MetricsMaxAge time.Duration
+	// DisableHTTP2 indicates that http2 should not be enabled.
+	DisableHTTP2  bool
+	metricsConfig *adaptercfg.MetricsDiscoveryConfig
+}
+
+func (cmd *PrometheusAdapter) makePromClient() (prom.Client, error) {
+	baseURL, err := url.Parse(cmd.PrometheusURL)
+	if err != nil {
+		return nil, fmt.Errorf("invalid Prometheus URL %q: %v", baseURL, err)
+	}
+
+	if cmd.PrometheusVerb != http.MethodGet && cmd.PrometheusVerb != http.MethodPost {
+		return nil, fmt.Errorf("unsupported Prometheus HTTP verb %q; supported verbs: \"GET\" and \"POST\"", cmd.PrometheusVerb)
+	}
+
+	var httpClient *http.Client
+
+	if cmd.PrometheusCAFile != "" {
+		prometheusCAClient, err := makePrometheusCAClient(cmd.PrometheusCAFile, cmd.PrometheusClientTLSCertFile, cmd.PrometheusClientTLSKeyFile)
+		if err != nil {
+			return nil, err
+		}
+		httpClient = prometheusCAClient
+		klog.Info("successfully loaded ca from file")
+	} else {
+		kubeconfigHTTPClient, err := makeKubeconfigHTTPClient(cmd.PrometheusAuthInCluster, cmd.PrometheusAuthConf)
+		if err != nil {
+			return nil, err
+		}
+		httpClient = kubeconfigHTTPClient
+		klog.Info("successfully using in-cluster auth")
+	}
+
+	if cmd.PrometheusTokenFile != "" {
+		data, err := os.ReadFile(cmd.PrometheusTokenFile)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read prometheus-token-file: %v", err)
+		}
+		wrappedTransport := http.DefaultTransport
+		if httpClient.Transport != nil {
+			wrappedTransport = httpClient.Transport
+		}
+		httpClient.Transport = transport.NewBearerAuthRoundTripper(string(data), wrappedTransport)
+	}
+	genericPromClient := prom.NewGenericAPIClient(httpClient, baseURL, parseHeaderArgs(cmd.PrometheusHeaders))
+	instrumentedGenericPromClient := mprom.InstrumentGenericAPIClient(genericPromClient, baseURL.String())
+	return prom.NewClientForAPI(instrumentedGenericPromClient, cmd.PrometheusVerb), nil
+}
+
+func (cmd *PrometheusAdapter) addFlags() {
+	cmd.Flags().StringVar(&cmd.PrometheusURL, "prometheus-url", cmd.PrometheusURL,
+		"URL for connecting to Prometheus.")
+	cmd.Flags().BoolVar(&cmd.PrometheusAuthInCluster, "prometheus-auth-incluster", cmd.PrometheusAuthInCluster,
+		"use auth details from the in-cluster kubeconfig when connecting to prometheus.")
+	cmd.Flags().StringVar(&cmd.PrometheusAuthConf, "prometheus-auth-config", cmd.PrometheusAuthConf,
+		"kubeconfig file used to configure auth when connecting to Prometheus.")
+	cmd.Flags().StringVar(&cmd.PrometheusCAFile, "prometheus-ca-file", cmd.PrometheusCAFile,
+		"Optional CA file to use when connecting with Prometheus")
+	cmd.Flags().StringVar(&cmd.PrometheusClientTLSCertFile, "prometheus-client-tls-cert-file", cmd.PrometheusClientTLSCertFile,
+		"Optional client TLS cert file to use when connecting with Prometheus, auto-renewal is not supported")
+	cmd.Flags().StringVar(&cmd.PrometheusClientTLSKeyFile, "prometheus-client-tls-key-file", cmd.PrometheusClientTLSKeyFile,
+		"Optional client TLS key file to use when connecting with Prometheus, auto-renewal is not supported")
+	cmd.Flags().StringVar(&cmd.PrometheusTokenFile, "prometheus-token-file", cmd.PrometheusTokenFile,
+		"Optional file containing the bearer token to use when connecting with Prometheus")
+	cmd.Flags().StringArrayVar(&cmd.PrometheusHeaders, "prometheus-header", cmd.PrometheusHeaders,
+		"Optional header to set on requests to prometheus-url. Can be repeated")
+	cmd.Flags().StringVar(&cmd.PrometheusVerb, "prometheus-verb", cmd.PrometheusVerb,
+		"HTTP verb to set on requests to Prometheus. Possible values: \"GET\", \"POST\"")
+	cmd.Flags().StringVar(&cmd.AdapterConfigFile, "config", cmd.AdapterConfigFile,
+		"Configuration file containing details of how to transform between Prometheus metrics "+
+			"and custom metrics API resources")
+	cmd.Flags().DurationVar(&cmd.MetricsRelistInterval, "metrics-relist-interval", cmd.MetricsRelistInterval,
+		"interval at which to re-list the set of all available metrics from Prometheus")
+	cmd.Flags().DurationVar(&cmd.MetricsMaxAge, "metrics-max-age", cmd.MetricsMaxAge,
+		"period for which to query the set of available metrics from Prometheus")
+	cmd.Flags().BoolVar(&cmd.DisableHTTP2, "disable-http2", cmd.DisableHTTP2,
+		"Disable HTTP/2 support")
+
+	// Add logging flags
+	logs.AddFlags(cmd.Flags())
+}
+
+func (cmd *PrometheusAdapter) loadConfig() error {
+	// load metrics discovery configuration
+	if cmd.AdapterConfigFile == "" {
+		return fmt.Errorf("no metrics discovery configuration file specified (make sure to use --config)")
+	}
+	metricsConfig, err := adaptercfg.FromFile(cmd.AdapterConfigFile)
+	if err != nil {
+		return fmt.Errorf("unable to load metrics discovery configuration: %v", err)
+	}
+
+	cmd.metricsConfig = metricsConfig
+
+	return nil
+}
+
+func (cmd *PrometheusAdapter) makeProvider(promClient prom.Client, stopCh <-chan struct{}) (provider.CustomMetricsProvider, error) {
+	if len(cmd.metricsConfig.Rules) == 0 {
+		return nil, nil
+	}
+
+	if cmd.MetricsMaxAge < cmd.MetricsRelistInterval {
+		return nil, fmt.Errorf("max age must not be less than relist interval")
+	}
+
+	// grab the mapper and dynamic client
+	mapper, err := cmd.RESTMapper()
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct RESTMapper: %v", err)
+	}
+	dynClient, err := cmd.DynamicClient()
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct Kubernetes client: %v", err)
+	}
+
+	// extract the namers
+	namers, err := naming.NamersFromConfig(cmd.metricsConfig.Rules, mapper)
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct naming scheme from metrics rules: %v", err)
+	}
+
+	// construct the provider and start it
+	cmProvider, runner := cmprov.NewPrometheusProvider(mapper, dynClient, promClient, namers, cmd.MetricsRelistInterval, cmd.MetricsMaxAge)
+	runner.RunUntil(stopCh)
+
+	return cmProvider, nil
+}
+
+func (cmd *PrometheusAdapter) makeExternalProvider(promClient prom.Client, stopCh <-chan struct{}) (provider.ExternalMetricsProvider, error) {
+	if len(cmd.metricsConfig.ExternalRules) == 0 {
+		return nil, nil
+	}
+
+	// grab the mapper
+	mapper, err := cmd.RESTMapper()
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct RESTMapper: %v", err)
+	}
+
+	// extract the namers
+	namers, err := naming.NamersFromConfig(cmd.metricsConfig.ExternalRules, mapper)
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct naming scheme from metrics rules: %v", err)
+	}
+
+	// construct the provider and start it
+	emProvider, runner := extprov.NewExternalPrometheusProvider(promClient, namers, cmd.MetricsRelistInterval, cmd.MetricsMaxAge)
+	runner.RunUntil(stopCh)
+
+	return emProvider, nil
+}
+
+func (cmd *PrometheusAdapter) addResourceMetricsAPI(promClient prom.Client, stopCh <-chan struct{}) error {
+	if cmd.metricsConfig.ResourceRules == nil {
+		// bail if we don't have rules for setting things up
+		return nil
+	}
+
+	mapper, err := cmd.RESTMapper()
+	if err != nil {
+		return err
+	}
+
+	provider, err := resprov.NewProvider(promClient, mapper, cmd.metricsConfig.ResourceRules)
+	if err != nil {
+		return fmt.Errorf("unable to construct resource metrics API provider: %v", err)
+	}
+
+	rest, err := cmd.ClientConfig()
+	if err != nil {
+		return err
+	}
+
+	client, err := metadata.NewForConfig(rest)
+	if err != nil {
+		return err
+	}
+
+	podInformerFactory := metadatainformer.NewFilteredSharedInformerFactory(client, 0, corev1.NamespaceAll, func(options *metav1.ListOptions) {
+		options.FieldSelector = "status.phase=Running"
+	})
+	podInformer := podInformerFactory.ForResource(corev1.SchemeGroupVersion.WithResource("pods"))
+
+	informer, err := cmd.Informers()
+	if err != nil {
+		return err
+	}
+
+	config, err := cmd.Config()
+	if err != nil {
+		return err
+	}
+	config.GenericConfig.EnableMetrics = false
+
+	server, err := cmd.Server()
+	if err != nil {
+		return err
+	}
+
+	metricsHandler, err := mprom.MetricsHandler()
+	if err != nil {
+		return err
+	}
+	server.GenericAPIServer.Handler.NonGoRestfulMux.HandleFunc("/metrics", metricsHandler)
+
+	if err := api.Install(provider, podInformer.Lister(), informer.Core().V1().Nodes().Lister(), server.GenericAPIServer, nil); err != nil {
+		return err
+	}
+
+	go podInformer.Informer().Run(stopCh)
+
+	return nil
+}
+
 func main() {
 	logs.InitLogs()
 	defer logs.FlushLogs()
 
-	if len(os.Getenv("GOMAXPROCS")) == 0 {
-		runtime.GOMAXPROCS(runtime.NumCPU())
+	// set up flags
+	cmd := &PrometheusAdapter{
+		PrometheusURL:         "https://localhost",
+		PrometheusVerb:        http.MethodGet,
+		MetricsRelistInterval: 10 * time.Minute,
+	}
+	cmd.Name = "prometheus-metrics-adapter"
+
+	cmd.addFlags()
+	if err := cmd.Flags().Parse(os.Args); err != nil {
+		klog.Fatalf("unable to parse flags: %v", err)
 	}
 
-	cmd := app.NewCommandStartPrometheusAdapterServer(os.Stdout, os.Stderr, wait.NeverStop)
-	cmd.Flags().AddGoFlagSet(flag.CommandLine)
-	if err := cmd.Execute(); err != nil {
-		panic(err)
+	if cmd.OpenAPIConfig == nil {
+		cmd.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(generatedopenapi.GetOpenAPIDefinitions, openapinamer.NewDefinitionNamer(api.Scheme, customexternalmetrics.Scheme))
+		cmd.OpenAPIConfig.Info.Title = "prometheus-metrics-adapter"
+		cmd.OpenAPIConfig.Info.Version = "1.0.0"
+	}
+
+	if cmd.OpenAPIV3Config == nil {
+		cmd.OpenAPIV3Config = genericapiserver.DefaultOpenAPIV3Config(generatedopenapi.GetOpenAPIDefinitions, openapinamer.NewDefinitionNamer(api.Scheme, customexternalmetrics.Scheme))
+		cmd.OpenAPIV3Config.Info.Title = "prometheus-metrics-adapter"
+		cmd.OpenAPIV3Config.Info.Version = "1.0.0"
+	}
+
+	// if --metrics-max-age is not set, make it equal to --metrics-relist-interval
+	if cmd.MetricsMaxAge == 0*time.Second {
+		cmd.MetricsMaxAge = cmd.MetricsRelistInterval
+	}
+
+	// make the prometheus client
+	promClient, err := cmd.makePromClient()
+	if err != nil {
+		klog.Fatalf("unable to construct Prometheus client: %v", err)
+	}
+
+	// load the config
+	if err := cmd.loadConfig(); err != nil {
+		klog.Fatalf("unable to load metrics discovery config: %v", err)
+	}
+
+	// stop channel closed on SIGTERM and SIGINT
+	stopCh := genericapiserver.SetupSignalHandler()
+
+	// construct the provider
+	cmProvider, err := cmd.makeProvider(promClient, stopCh)
+	if err != nil {
+		klog.Fatalf("unable to construct custom metrics provider: %v", err)
+	}
+
+	// attach the provider to the server, if it's needed
+	if cmProvider != nil {
+		cmd.WithCustomMetrics(cmProvider)
+	}
+
+	// construct the external provider
+	emProvider, err := cmd.makeExternalProvider(promClient, stopCh)
+	if err != nil {
+		klog.Fatalf("unable to construct external metrics provider: %v", err)
+	}
+
+	// attach the provider to the server, if it's needed
+	if emProvider != nil {
+		cmd.WithExternalMetrics(emProvider)
+	}
+
+	// attach resource metrics support, if it's needed
+	if err := cmd.addResourceMetricsAPI(promClient, stopCh); err != nil {
+		klog.Fatalf("unable to install resource metrics API: %v", err)
+	}
+
+	// disable HTTP/2 to mitigate CVE-2023-44487 until the Go standard library
+	// and golang.org/x/net are fully fixed.
+	server, err := cmd.Server()
+	if err != nil {
+		klog.Fatalf("unable to fetch server: %v", err)
+	}
+	server.GenericAPIServer.SecureServingInfo.DisableHTTP2 = cmd.DisableHTTP2
+
+	// run the server
+	if err := cmd.Run(stopCh); err != nil {
+		klog.Fatalf("unable to run custom metrics adapter: %v", err)
 	}
 }
+
+// makeKubeconfigHTTPClient constructs an HTTP for connecting with the given auth options.
+func makeKubeconfigHTTPClient(inClusterAuth bool, kubeConfigPath string) (*http.Client, error) {
+	// make sure we're not trying to use two different sources of auth
+	if inClusterAuth && kubeConfigPath != "" {
+		return nil, fmt.Errorf("may not use both in-cluster auth and an explicit kubeconfig at the same time")
+	}
+
+	// return the default client if we're using no auth
+	if !inClusterAuth && kubeConfigPath == "" {
+		return http.DefaultClient, nil
+	}
+
+	var authConf *rest.Config
+	if kubeConfigPath != "" {
+		var err error
+		loadingRules := &clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeConfigPath}
+		loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
+		authConf, err = loader.ClientConfig()
+		if err != nil {
+			return nil, fmt.Errorf("unable to construct auth configuration from %q for connecting to Prometheus: %v", kubeConfigPath, err)
+		}
+	} else {
+		var err error
+		authConf, err = rest.InClusterConfig()
+		if err != nil {
+			return nil, fmt.Errorf("unable to construct in-cluster auth configuration for connecting to Prometheus: %v", err)
+		}
+	}
+	tr, err := rest.TransportFor(authConf)
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct client transport for connecting to Prometheus: %v", err)
+	}
+	return &http.Client{Transport: tr}, nil
+}
+
+func makePrometheusCAClient(caFilePath string, tlsCertFilePath string, tlsKeyFilePath string) (*http.Client, error) {
+	data, err := os.ReadFile(caFilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read prometheus-ca-file: %v", err)
+	}
+
+	pool := x509.NewCertPool()
+	if !pool.AppendCertsFromPEM(data) {
+		return nil, fmt.Errorf("no certs found in prometheus-ca-file")
+	}
+
+	if (tlsCertFilePath != "") && (tlsKeyFilePath != "") {
+		tlsClientCerts, err := tls.LoadX509KeyPair(tlsCertFilePath, tlsKeyFilePath)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read TLS key pair: %v", err)
+		}
+		return &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: &tls.Config{
+					RootCAs:      pool,
+					Certificates: []tls.Certificate{tlsClientCerts},
+					MinVersion:   tls.VersionTLS12,
+				},
+			},
+		}, nil
+	}
+
+	return &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				RootCAs:    pool,
+				MinVersion: tls.VersionTLS12,
+			},
+		},
+	}, nil
+}
+
+func parseHeaderArgs(args []string) http.Header {
+	headers := make(http.Header, len(args))
+	for _, h := range args {
+		parts := strings.SplitN(h, "=", 2)
+		value := ""
+		if len(parts) > 1 {
+			value = parts[1]
+		}
+		headers.Add(parts[0], value)
+	}
+	return headers
+}

cmd/adapter/adapter_test.go

@@ -0,0 +1,211 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"net/http"
+	"os"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+const certsDir = "testdata"
+
+func TestMakeKubeconfigHTTPClient(t *testing.T) {
+	tests := []struct {
+		kubeconfigPath string
+		inClusterAuth  bool
+		success        bool
+	}{
+		{
+			kubeconfigPath: filepath.Join(certsDir, "kubeconfig"),
+			inClusterAuth:  false,
+			success:        true,
+		},
+		{
+			kubeconfigPath: filepath.Join(certsDir, "kubeconfig"),
+			inClusterAuth:  true,
+			success:        false,
+		},
+		{
+			kubeconfigPath: filepath.Join(certsDir, "kubeconfig-error"),
+			inClusterAuth:  false,
+			success:        false,
+		},
+		{
+			kubeconfigPath: "",
+			inClusterAuth:  false,
+			success:        true,
+		},
+	}
+
+	os.Setenv("KUBERNETES_SERVICE_HOST", "prometheus")
+	os.Setenv("KUBERNETES_SERVICE_PORT", "8080")
+
+	for _, test := range tests {
+		t.Logf("Running test for: inClusterAuth %v, kubeconfigPath %v", test.inClusterAuth, test.kubeconfigPath)
+		kubeconfigHTTPClient, err := makeKubeconfigHTTPClient(test.inClusterAuth, test.kubeconfigPath)
+		if test.success {
+			if err != nil {
+				t.Errorf("Error is %v, expected nil", err)
+				continue
+			}
+			if kubeconfigHTTPClient.Transport == nil {
+				if test.inClusterAuth || test.kubeconfigPath != "" {
+					t.Error("HTTP client Transport is nil, expected http.RoundTripper")
+				}
+			}
+		} else if err == nil {
+			t.Errorf("Error is nil, expected %v", err)
+		}
+	}
+}
+
+func TestMakePrometheusCAClient(t *testing.T) {
+	tests := []struct {
+		caFilePath      string
+		tlsCertFilePath string
+		tlsKeyFilePath  string
+		success         bool
+		tlsUsed         bool
+	}{
+		{
+			caFilePath:      filepath.Join(certsDir, "ca.pem"),
+			tlsCertFilePath: filepath.Join(certsDir, "tlscert.crt"),
+			tlsKeyFilePath:  filepath.Join(certsDir, "tlskey.key"),
+			success:         true,
+			tlsUsed:         true,
+		},
+		{
+			caFilePath:      filepath.Join(certsDir, "ca-error.pem"),
+			tlsCertFilePath: filepath.Join(certsDir, "tlscert.crt"),
+			tlsKeyFilePath:  filepath.Join(certsDir, "tlskey.key"),
+			success:         false,
+			tlsUsed:         true,
+		},
+		{
+			caFilePath:      filepath.Join(certsDir, "ca.pem"),
+			tlsCertFilePath: filepath.Join(certsDir, "tlscert-error.crt"),
+			tlsKeyFilePath:  filepath.Join(certsDir, "tlskey.key"),
+			success:         false,
+			tlsUsed:         true,
+		},
+		{
+			caFilePath:      filepath.Join(certsDir, "ca.pem"),
+			tlsCertFilePath: "",
+			tlsKeyFilePath:  "",
+			success:         true,
+			tlsUsed:         false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Logf("Running test for: caFilePath %v, tlsCertFilePath %v, tlsKeyFilePath %v", test.caFilePath, test.tlsCertFilePath, test.tlsKeyFilePath)
+		prometheusCAClient, err := makePrometheusCAClient(test.caFilePath, test.tlsCertFilePath, test.tlsKeyFilePath)
+		if test.success {
+			if err != nil {
+				t.Errorf("Error is %v, expected nil", err)
+				continue
+			}
+			if prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.RootCAs == nil {
+				t.Error("RootCAs is nil, expected *x509.CertPool")
+				continue
+			}
+			if test.tlsUsed {
+				if prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.Certificates == nil {
+					t.Error("TLS certificates is nil, expected []tls.Certificate")
+					continue
+				}
+			} else {
+				if prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.Certificates != nil {
+					t.Errorf("TLS certificates is %+v, expected nil", prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.Certificates)
+				}
+			}
+		} else if err == nil {
+			t.Errorf("Error is nil, expected %v", err)
+		}
+	}
+}
+
+func TestParseHeaderArgs(t *testing.T) {
+	tests := []struct {
+		args    []string
+		headers http.Header
+	}{
+		{
+			headers: http.Header{},
+		},
+		{
+			args: []string{"foo=bar"},
+			headers: http.Header{
+				"Foo": []string{"bar"},
+			},
+		},
+		{
+			args: []string{"foo"},
+			headers: http.Header{
+				"Foo": []string{""},
+			},
+		},
+		{
+			args: []string{"foo=bar", "foo=baz", "bux=baz=23"},
+			headers: http.Header{
+				"Foo": []string{"bar", "baz"},
+				"Bux": []string{"baz=23"},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		got := parseHeaderArgs(test.args)
+		if !reflect.DeepEqual(got, test.headers) {
+			t.Errorf("Expected %#v but got %#v", test.headers, got)
+		}
+	}
+}
+
+func TestFlags(t *testing.T) {
+	cmd := &PrometheusAdapter{
+		PrometheusURL: "https://localhost",
+	}
+	cmd.addFlags()
+
+	flags := cmd.FlagSet
+	if flags == nil {
+		t.Fatalf("FlagSet should not be nil")
+	}
+
+	expectedFlags := []struct {
+		flag         string
+		defaultValue string
+	}{
+		{flag: "v", defaultValue: "0"},                              // logging flag (klog)
+		{flag: "prometheus-url", defaultValue: "https://localhost"}, // default is set in cmd
+	}
+
+	for _, e := range expectedFlags {
+		flag := flags.Lookup(e.flag)
+		if flag == nil {
+			t.Errorf("Flag %q expected to be present, was absent", e.flag)
+			continue
+		}
+		if flag.DefValue != e.defaultValue {
+			t.Errorf("Expected default value %q for flag %q, got %q", e.defaultValue, e.flag, flag.DefValue)
+		}
+	}
+}

cmd/adapter/app/start.go

@@ -1,156 +0,0 @@
-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package app
-
-import (
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"time"
-
-	"github.com/spf13/cobra"
-	apimeta "k8s.io/apimachinery/pkg/api/meta"
-	"k8s.io/client-go/discovery"
-	"k8s.io/client-go/dynamic"
-	"k8s.io/client-go/rest"
-	"k8s.io/client-go/tools/clientcmd"
-
-	prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
-	mprom "github.com/directxman12/k8s-prometheus-adapter/pkg/client/metrics"
-	cmprov "github.com/directxman12/k8s-prometheus-adapter/pkg/custom-provider"
-	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/cmd/server"
-	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/dynamicmapper"
-)
-
-// NewCommandStartPrometheusAdapterServer provides a CLI handler for 'start master' command
-func NewCommandStartPrometheusAdapterServer(out, errOut io.Writer, stopCh <-chan struct{}) *cobra.Command {
-	baseOpts := server.NewCustomMetricsAdapterServerOptions(out, errOut)
-	o := PrometheusAdapterServerOptions{
-		CustomMetricsAdapterServerOptions: baseOpts,
-		MetricsRelistInterval:             10 * time.Minute,
-		RateInterval:                      5 * time.Minute,
-		PrometheusURL:                     "https://localhost",
-		DiscoveryInterval:                 10 * time.Minute,
-	}
-
-	cmd := &cobra.Command{
-		Short: "Launch the custom metrics API adapter server",
-		Long:  "Launch the custom metrics API adapter server",
-		RunE: func(c *cobra.Command, args []string) error {
-			if err := o.Complete(); err != nil {
-				return err
-			}
-			if err := o.Validate(args); err != nil {
-				return err
-			}
-			if err := o.RunCustomMetricsAdapterServer(stopCh); err != nil {
-				return err
-			}
-			return nil
-		},
-	}
-
-	flags := cmd.Flags()
-	o.SecureServing.AddFlags(flags)
-	o.Authentication.AddFlags(flags)
-	o.Authorization.AddFlags(flags)
-	o.Features.AddFlags(flags)
-
-	flags.StringVar(&o.RemoteKubeConfigFile, "lister-kubeconfig", o.RemoteKubeConfigFile, ""+
-		"kubeconfig file pointing at the 'core' kubernetes server with enough rights to list "+
-		"any described objets")
-	flags.DurationVar(&o.MetricsRelistInterval, "metrics-relist-interval", o.MetricsRelistInterval, ""+
-		"interval at which to re-list the set of all available metrics from Prometheus")
-	flags.DurationVar(&o.RateInterval, "rate-interval", o.RateInterval, ""+
-		"period of time used to calculate rate metrics from cumulative metrics")
-	flags.DurationVar(&o.DiscoveryInterval, "discovery-interval", o.DiscoveryInterval, ""+
-		"interval at which to refresh API discovery information")
-	flags.StringVar(&o.PrometheusURL, "prometheus-url", o.PrometheusURL,
-		"URL and configuration for connecting to Prometheus.  Query parameters are used to configure the connection")
-
-	return cmd
-}
-
-func (o PrometheusAdapterServerOptions) RunCustomMetricsAdapterServer(stopCh <-chan struct{}) error {
-	config, err := o.Config()
-	if err != nil {
-		return err
-	}
-
-	config.GenericConfig.EnableMetrics = true
-
-	var clientConfig *rest.Config
-	if len(o.RemoteKubeConfigFile) > 0 {
-		loadingRules := &clientcmd.ClientConfigLoadingRules{ExplicitPath: o.RemoteKubeConfigFile}
-		loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{})
-
-		clientConfig, err = loader.ClientConfig()
-	} else {
-		clientConfig, err = rest.InClusterConfig()
-	}
-	if err != nil {
-		return fmt.Errorf("unable to construct lister client config to initialize provider: %v", err)
-	}
-
-	discoveryClient, err := discovery.NewDiscoveryClientForConfig(clientConfig)
-	if err != nil {
-		return fmt.Errorf("unable to construct discovery client for dynamic client: %v", err)
-	}
-
-	dynamicMapper, err := dynamicmapper.NewRESTMapper(discoveryClient, apimeta.InterfacesForUnstructured, o.DiscoveryInterval)
-	if err != nil {
-		return fmt.Errorf("unable to construct dynamic discovery mapper: %v", err)
-	}
-
-	clientPool := dynamic.NewClientPool(clientConfig, dynamicMapper, dynamic.LegacyAPIPathResolverFunc)
-	if err != nil {
-		return fmt.Errorf("unable to construct lister client to initialize provider: %v", err)
-	}
-
-	// TODO: actually configure this client (strip query vars, etc)
-	baseURL, err := url.Parse(o.PrometheusURL)
-	if err != nil {
-		return fmt.Errorf("invalid Prometheus URL %q: %v", baseURL, err)
-	}
-	genericPromClient := prom.NewGenericAPIClient(http.DefaultClient, baseURL)
-	instrumentedGenericPromClient := mprom.InstrumentGenericAPIClient(genericPromClient, baseURL.String())
-	promClient := prom.NewClientForAPI(instrumentedGenericPromClient)
-
-	cmProvider := cmprov.NewPrometheusProvider(dynamicMapper, clientPool, promClient, o.MetricsRelistInterval, o.RateInterval, stopCh)
-
-	server, err := config.Complete().New("prometheus-custom-metrics-adapter", cmProvider)
-	if err != nil {
-		return err
-	}
-	return server.GenericAPIServer.PrepareRun().Run(stopCh)
-}
-
-type PrometheusAdapterServerOptions struct {
-	*server.CustomMetricsAdapterServerOptions
-
-	// RemoteKubeConfigFile is the config used to list pods from the master API server
-	RemoteKubeConfigFile string
-	// MetricsRelistInterval is the interval at which to relist the set of available metrics
-	MetricsRelistInterval time.Duration
-	// RateInterval is the period of time used to calculate rate metrics
-	RateInterval time.Duration
-	// DiscoveryInterval is the interval at which discovery information is refreshed
-	DiscoveryInterval time.Duration
-	// PrometheusURL is the URL describing how to connect to Prometheus.  Query parameters configure connection options.
-	PrometheusURL string
-}

cmd/adapter/testdata/ca-error.pem

@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

cmd/adapter/testdata/ca.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

cmd/adapter/testdata/kubeconfig

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Config
+clusters:
+- name: test
+  cluster:
+    certificate-authority-data: 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
+    server: test.test
+contexts:
+- name: test
+  context:
+    cluster: test
+    user: test-user
+current-context: test
+users:
+- name: test-user
+  user:
+    token: abcde12345

cmd/adapter/testdata/kubeconfig-error

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Config
+clusters:
+- name: test
+  cluster:
+    certificate-authority-data: abcde12345
+    server: test.test
+contexts:
+- name: test
+  context:
+    cluster: test
+    user: test-user
+current-context: test
+users:
+- name: test-user
+  user:
+    token: abcde12345
+

cmd/adapter/testdata/tlscert-error.crt

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

cmd/adapter/testdata/tlscert.crt

@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

cmd/adapter/testdata/tlskey.key

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

cmd/config-gen/main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/spf13/cobra"
+	yaml "gopkg.in/yaml.v2"
+
+	"sigs.k8s.io/prometheus-adapter/cmd/config-gen/utils"
+)
+
+func main() {
+	var labelPrefix string
+	var rateInterval time.Duration
+
+	cmd := &cobra.Command{
+		Short: "Generate a config matching the legacy discovery rules",
+		Long: `Generate a config that produces the same functionality
+as the legacy discovery rules. This includes discovering metrics and associating
+resources according to the Kubernetes instrumention conventions and the cAdvisor
+conventions, and auto-converting cumulative metrics into rate metrics.`,
+		RunE: func(c *cobra.Command, args []string) error {
+			cfg := utils.DefaultConfig(rateInterval, labelPrefix)
+			enc := yaml.NewEncoder(os.Stdout)
+			if err := enc.Encode(cfg); err != nil {
+				return err
+			}
+			return enc.Close()
+		},
+	}
+
+	cmd.Flags().StringVar(&labelPrefix, "label-prefix", "",
+		"Prefix to expect on labels referring to pod resources.  For example, if the prefix is "+
+			"'kube_', any series with the 'kube_pod' label would be considered a pod metric")
+	cmd.Flags().DurationVar(&rateInterval, "rate-interval", 5*time.Minute,
+		"Period of time used to calculate rate metrics from cumulative metrics")
+
+	if err := cmd.Execute(); err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to generate config: %v\n", err)
+		os.Exit(1)
+	}
+}

cmd/config-gen/utils/default.go

@@ -0,0 +1,122 @@
+package utils
+
+import (
+	"fmt"
+	"time"
+
+	pmodel "github.com/prometheus/common/model"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/config"
+)
+
+// DefaultConfig returns a configuration equivalent to the former
+// pre-advanced-config settings.  This means that "normal" series labels
+// will be of the form `<prefix><<.Resource>>`, cadvisor series will be
+// of the form `container_`, and have the label `pod`.  Any series ending
+// in total will be treated as a rate metric.
+func DefaultConfig(rateInterval time.Duration, labelPrefix string) *config.MetricsDiscoveryConfig {
+	return &config.MetricsDiscoveryConfig{
+		Rules: []config.DiscoveryRule{
+			// container seconds rate metrics
+			{
+				SeriesQuery: string(prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod", ""))),
+				Resources: config.ResourceMapping{
+					Overrides: map[string]config.GroupResource{
+						"namespace": {Resource: "namespace"},
+						"pod":       {Resource: "pod"},
+					},
+				},
+				Name:         config.NameMapping{Matches: "^container_(.*)_seconds_total$"},
+				MetricsQuery: fmt.Sprintf(`sum(rate(<<.Series>>{<<.LabelMatchers>>,container!="POD"}[%s])) by (<<.GroupBy>>)`, pmodel.Duration(rateInterval).String()),
+			},
+
+			// container rate metrics
+			{
+				SeriesQuery:   string(prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod", ""))),
+				SeriesFilters: []config.RegexFilter{{IsNot: "^container_.*_seconds_total$"}},
+				Resources: config.ResourceMapping{
+					Overrides: map[string]config.GroupResource{
+						"namespace": {Resource: "namespace"},
+						"pod":       {Resource: "pod"},
+					},
+				},
+				Name:         config.NameMapping{Matches: "^container_(.*)_total$"},
+				MetricsQuery: fmt.Sprintf(`sum(rate(<<.Series>>{<<.LabelMatchers>>,container!="POD"}[%s])) by (<<.GroupBy>>)`, pmodel.Duration(rateInterval).String()),
+			},
+
+			// container non-cumulative metrics
+			{
+				SeriesQuery:   string(prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod", ""))),
+				SeriesFilters: []config.RegexFilter{{IsNot: "^container_.*_total$"}},
+				Resources: config.ResourceMapping{
+					Overrides: map[string]config.GroupResource{
+						"namespace": {Resource: "namespace"},
+						"pod":       {Resource: "pod"},
+					},
+				},
+				Name:         config.NameMapping{Matches: "^container_(.*)$"},
+				MetricsQuery: `sum(<<.Series>>{<<.LabelMatchers>>,container!="POD"}) by (<<.GroupBy>>)`,
+			},
+
+			// normal non-cumulative metrics
+			{
+				SeriesQuery:   string(prom.MatchSeries("", prom.LabelNeq(fmt.Sprintf("%snamespace", labelPrefix), ""), prom.NameNotMatches("^container_.*"))),
+				SeriesFilters: []config.RegexFilter{{IsNot: ".*_total$"}},
+				Resources: config.ResourceMapping{
+					Template: fmt.Sprintf("%s<<.Resource>>", labelPrefix),
+				},
+				MetricsQuery: "sum(<<.Series>>{<<.LabelMatchers>>}) by (<<.GroupBy>>)",
+			},
+
+			// normal rate metrics
+			{
+				SeriesQuery:   string(prom.MatchSeries("", prom.LabelNeq(fmt.Sprintf("%snamespace", labelPrefix), ""), prom.NameNotMatches("^container_.*"))),
+				SeriesFilters: []config.RegexFilter{{IsNot: ".*_seconds_total"}},
+				Name:          config.NameMapping{Matches: "^(.*)_total$"},
+				Resources: config.ResourceMapping{
+					Template: fmt.Sprintf("%s<<.Resource>>", labelPrefix),
+				},
+				MetricsQuery: fmt.Sprintf("sum(rate(<<.Series>>{<<.LabelMatchers>>}[%s])) by (<<.GroupBy>>)", pmodel.Duration(rateInterval).String()),
+			},
+
+			// seconds rate metrics
+			{
+				SeriesQuery: string(prom.MatchSeries("", prom.LabelNeq(fmt.Sprintf("%snamespace", labelPrefix), ""), prom.NameNotMatches("^container_.*"))),
+				Name:        config.NameMapping{Matches: "^(.*)_seconds_total$"},
+				Resources: config.ResourceMapping{
+					Template: fmt.Sprintf("%s<<.Resource>>", labelPrefix),
+				},
+				MetricsQuery: fmt.Sprintf("sum(rate(<<.Series>>{<<.LabelMatchers>>}[%s])) by (<<.GroupBy>>)", pmodel.Duration(rateInterval).String()),
+			},
+		},
+
+		ResourceRules: &config.ResourceRules{
+			CPU: config.ResourceRule{
+				ContainerQuery: fmt.Sprintf("sum(rate(container_cpu_usage_seconds_total{<<.LabelMatchers>>}[%s])) by (<<.GroupBy>>)", pmodel.Duration(rateInterval).String()),
+				NodeQuery:      fmt.Sprintf("sum(rate(container_cpu_usage_seconds_total{<<.LabelMatchers>>, id='/'}[%s])) by (<<.GroupBy>>)", pmodel.Duration(rateInterval).String()),
+				Resources: config.ResourceMapping{
+					Overrides: map[string]config.GroupResource{
+						"namespace": {Resource: "namespace"},
+						"pod":       {Resource: "pod"},
+						"instance":  {Resource: "node"},
+					},
+				},
+				ContainerLabel: fmt.Sprintf("%scontainer", labelPrefix),
+			},
+			Memory: config.ResourceRule{
+				ContainerQuery: "sum(container_memory_working_set_bytes{<<.LabelMatchers>>}) by (<<.GroupBy>>)",
+				NodeQuery:      "sum(container_memory_working_set_bytes{<<.LabelMatchers>>,id='/'}) by (<<.GroupBy>>)",
+				Resources: config.ResourceMapping{
+					Overrides: map[string]config.GroupResource{
+						"namespace": {Resource: "namespace"},
+						"pod":       {Resource: "pod"},
+						"instance":  {Resource: "node"},
+					},
+				},
+				ContainerLabel: fmt.Sprintf("%scontainer", labelPrefix),
+			},
+			Window: pmodel.Duration(rateInterval),
+		},
+	}
+}

code-of-conduct.md

@@ -0,0 +1,3 @@
+# Kubernetes Community Code of Conduct
+
+Please refer to our [Kubernetes Community Code of Conduct](https://git.k8s.io/community/code-of-conduct.md)

deploy/Dockerfile

@@ -1,4 +0,0 @@
-FROM BASEIMAGE
-COPY adapter /
-USER 1001:1001
-ENTRYPOINT ["/adapter"]

deploy/README.md

@@ -1,13 +1,11 @@
 Example Deployment
 ==================
 
-1. Make sure you've built the included Dockerfile with `make docker-build`. The image should be tagged as `directxman12/k8s-prometheus-adapter:latest`.
-   
-2. Create a secret called `cm-adapter-serving-certs` with two values:
-   `serving.crt` and `serving.key`. For more information on how to
-   generate these certificates, see the [auth concepts
-   documentation](https://github.com/kubernetes-incubator/apiserver-builder/blob/master/docs/concepts/auth.md)
-   in the apiserver-builder repository.
+1. Make sure you've built the included Dockerfile with `TAG=latest make container`. The image should be tagged as `registry.k8s.io/prometheus-adapter/staging-prometheus-adapter:latest`.
 
-3. `kubectl create -f example-deployment.yaml`, modifying as necessary to
-   point to your prometheus server.
+2. `kubectl create namespace monitoring` to ensure that the namespace that we're installing
+   the custom metrics adapter in exists.
+
+3. `kubectl create -f manifests/`, modifying the Deployment as necessary to
+   point to your Prometheus server, and the ConfigMap to contain your desired
+   metrics discovery configuration.

deploy/example-deployment.yaml

@@ -1,156 +0,0 @@
-kind: Namespace
-apiVersion: v1
-metadata:
-  name: custom-metrics
----
-kind: ServiceAccount
-apiVersion: v1
-metadata:
-  name: custom-metrics-apiserver
-  namespace: custom-metrics
----
-apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: ClusterRoleBinding
-metadata:
-  name: custom-metrics:system:auth-delegator
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: system:auth-delegator
-subjects:
-- kind: ServiceAccount
-  name: custom-metrics-apiserver
-  namespace: custom-metrics
----
-apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: RoleBinding
-metadata:
-  name: custom-metrics-auth-reader
-  namespace: kube-system
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: Role
-  name: extension-apiserver-authentication-reader
-subjects:
-- kind: ServiceAccount
-  name: custom-metrics-apiserver
-  namespace: custom-metrics
----
-apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: ClusterRole
-metadata:
-  name: custom-metrics-resource-reader
-rules:
-- apiGroups:
-  - ""
-  resources:
-  - namespaces
-  - pods
-  - services
-  verbs:
-  - get
-  - list
----
-apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: ClusterRoleBinding
-metadata:
-  name: custom-metrics-resource-reader
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: custom-metrics-resource-reader
-subjects:
-- kind: ServiceAccount
-  name: custom-metrics-apiserver
-  namespace: custom-metrics
----
-apiVersion: extensions/v1beta1
-kind: Deployment
-metadata:
-  labels:
-    app: custom-metrics-apiserver
-  name: custom-metrics-apiserver
-spec:
-  replicas: 1
-  selector:
-    matchLabels:
-      app: custom-metrics-apiserver
-  template:
-    metadata:
-      labels:
-        app: custom-metrics-apiserver
-      name: custom-metrics-apiserver
-    spec:
-      serviceAccountName: custom-metrics-apiserver
-      containers:
-      - name: custom-metrics-apiserver
-        image: directxman12/k8s-prometheus-adapter
-        args:
-        - /adapter
-        - --secure-port=6443
-        - --tls-cert-file=/var/run/serving-cert/serving.crt
-        - --tls-private-key-file=/var/run/serving-cert/serving.key
-        - --logtostderr=true
-        - --prometheus-url=http://prometheus.prom.svc:9090/
-        - --metrics-relist-interval=30s
-        - --rate-interval=30s
-        - --v=10
-        ports:
-        - containerPort: 6443
-        volumeMounts:
-        - mountPath: /var/run/serving-cert
-          name: volume-serving-cert
-          readOnly: true
-      volumes:
-      - name: volume-serving-cert
-        secret:
-          secretName: cm-adapter-serving-certs
----
-apiVersion: v1
-kind: Service
-metadata:
-  name: api
-  namespace: custom-metrics
-spec:
-  ports:
-  - port: 443
-    targetPort: 6443
-  selector:
-    app: custom-metrics-apiserver
----
-apiVersion: apiregistration.k8s.io/v1beta1
-kind: APIService
-metadata:
-  name: v1alpha1.custom-metrics.metrics.k8s.io
-spec:
-  insecureSkipTLSVerify: true
-  group: custom-metrics.metrics.k8s.io
-  priority: 150
-  service:
-    name: api
-    namespace: custom-metrics
-  version: v1alpha1
----
-# Make a ClusterRole so that the HPA controller is able to read the custom metrics this adapter provides
-apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: ClusterRole
-metadata:
-  name: custom-metrics-server-resources
-rules:
-- apiGroups:
-  - custom-metrics.metrics.k8s.io
-  resources: ["*"]
-  verbs: ["*"]
----
-apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: ClusterRoleBinding
-metadata:
-  name: hpa-controller-custom-metrics
-roleRef:
-  apiGroup: rbac.authorization.k8s.io
-  kind: ClusterRole
-  name: custom-metrics-server-resources
-subjects:
-- kind: ServiceAccount
-  name: horizontal-pod-autoscaler
-  namespace: kube-system

deploy/manifests/api-service.yaml

@@ -0,0 +1,17 @@
+apiVersion: apiregistration.k8s.io/v1
+kind: APIService
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: v1beta1.metrics.k8s.io
+spec:
+  group: metrics.k8s.io
+  groupPriorityMinimum: 100
+  insecureSkipTLSVerify: true
+  service:
+    name: prometheus-adapter
+    namespace: monitoring
+  version: v1beta1
+  versionPriority: 100

deploy/manifests/cluster-role-aggregated-metrics-reader.yaml

@@ -0,0 +1,22 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+    rbac.authorization.k8s.io/aggregate-to-admin: "true"
+    rbac.authorization.k8s.io/aggregate-to-edit: "true"
+    rbac.authorization.k8s.io/aggregate-to-view: "true"
+  name: system:aggregated-metrics-reader
+  namespace: monitoring
+rules:
+- apiGroups:
+  - metrics.k8s.io
+  resources:
+  - pods
+  - nodes
+  verbs:
+  - get
+  - list
+  - watch

deploy/manifests/cluster-role-binding-delegator.yaml

@@ -0,0 +1,17 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: resource-metrics:system:auth-delegator
+  namespace: monitoring
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: system:auth-delegator
+subjects:
+- kind: ServiceAccount
+  name: prometheus-adapter
+  namespace: monitoring

deploy/manifests/cluster-role-binding-hpa-custom-metrics.yaml

@@ -0,0 +1,15 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: hpa-controller-custom-metrics
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: custom-metrics-server-resources
+subjects:
+- kind: ServiceAccount
+  name: horizontal-pod-autoscaler
+  namespace: kube-system

deploy/manifests/cluster-role-binding.yaml

@@ -0,0 +1,17 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: prometheus-adapter
+  namespace: monitoring
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: prometheus-adapter
+subjects:
+- kind: ServiceAccount
+  name: prometheus-adapter
+  namespace: monitoring

deploy/manifests/cluster-role-metrics-server-resources.yaml

@@ -0,0 +1,15 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: resource-metrics-server-resources
+rules:
+- apiGroups:
+  - metrics.k8s.io
+  resources:
+  - '*'
+  verbs:
+  - '*'

deploy/manifests/cluster-role.yaml

@@ -0,0 +1,20 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: prometheus-adapter
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - nodes
+  - namespaces
+  - pods
+  - services
+  verbs:
+  - get
+  - list
+  - watch

deploy/manifests/config-map.yaml

@@ -0,0 +1,53 @@
+apiVersion: v1
+data:
+  config.yaml: |-
+    "resourceRules":
+      "cpu":
+        "containerLabel": "container"
+        "containerQuery": |
+          sum by (<<.GroupBy>>) (
+            irate (
+                container_cpu_usage_seconds_total{<<.LabelMatchers>>,container!="",pod!=""}[4m]
+            )
+          )
+        "nodeQuery": |
+          sum by (<<.GroupBy>>) (
+            irate(
+                node_cpu_usage_seconds_total{<<.LabelMatchers>>}[4m]
+            )
+          )
+        "resources":
+          "overrides":
+            "namespace":
+              "resource": "namespace"
+            "node":
+              "resource": "node"
+            "pod":
+              "resource": "pod"
+      "memory":
+        "containerLabel": "container"
+        "containerQuery": |
+          sum by (<<.GroupBy>>) (
+            container_memory_working_set_bytes{<<.LabelMatchers>>,container!="",pod!=""}
+          )
+        "nodeQuery": |
+          sum by (<<.GroupBy>>) (
+            node_memory_working_set_bytes{<<.LabelMatchers>>}
+          )
+        "resources":
+          "overrides":
+            "node":
+              "resource": "node"
+            "namespace":
+              "resource": "namespace"
+            "pod":
+              "resource": "pod"
+      "window": "5m"
+kind: ConfigMap
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: adapter-config
+  namespace: monitoring

deploy/manifests/deployment.yaml

@@ -0,0 +1,89 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: prometheus-adapter
+  namespace: monitoring
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app.kubernetes.io/component: metrics-adapter
+      app.kubernetes.io/name: prometheus-adapter
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/component: metrics-adapter
+        app.kubernetes.io/name: prometheus-adapter
+        app.kubernetes.io/version: 0.12.0
+    spec:
+      automountServiceAccountToken: true
+      containers:
+      - args:
+        - --cert-dir=/var/run/serving-cert
+        - --config=/etc/adapter/config.yaml
+        - --metrics-relist-interval=1m
+        - --prometheus-url=https://prometheus.monitoring.svc:9090/
+        - --secure-port=6443
+        - --tls-cipher-suites=TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA
+        image: registry.k8s.io/prometheus-adapter/prometheus-adapter:v0.12.0
+        livenessProbe:
+          failureThreshold: 5
+          httpGet:
+            path: /livez
+            port: https
+            scheme: HTTPS
+          initialDelaySeconds: 30
+          periodSeconds: 5
+        name: prometheus-adapter
+        ports:
+        - containerPort: 6443
+          name: https
+        readinessProbe:
+          failureThreshold: 5
+          httpGet:
+            path: /readyz
+            port: https
+            scheme: HTTPS
+          initialDelaySeconds: 30
+          periodSeconds: 5
+        resources:
+          requests:
+            cpu: 102m
+            memory: 180Mi
+        securityContext:
+          allowPrivilegeEscalation: false
+          capabilities:
+            drop:
+            - ALL
+          readOnlyRootFilesystem: true
+        terminationMessagePolicy: FallbackToLogsOnError
+        volumeMounts:
+        - mountPath: /tmp
+          name: tmpfs
+          readOnly: false
+        - mountPath: /var/run/serving-cert
+          name: volume-serving-cert
+          readOnly: false
+        - mountPath: /etc/adapter
+          name: config
+          readOnly: false
+      nodeSelector:
+        kubernetes.io/os: linux
+      securityContext: {}
+      serviceAccountName: prometheus-adapter
+      volumes:
+      - emptyDir: {}
+        name: tmpfs
+      - emptyDir: {}
+        name: volume-serving-cert
+      - configMap:
+          name: adapter-config
+        name: config

deploy/manifests/network-policy.yaml

@@ -0,0 +1,21 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: prometheus-adapter
+  namespace: monitoring
+spec:
+  egress:
+  - {}
+  ingress:
+  - {}
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/component: metrics-adapter
+      app.kubernetes.io/name: prometheus-adapter
+  policyTypes:
+  - Egress
+  - Ingress

deploy/manifests/pod-disruption-budget.yaml

@@ -0,0 +1,15 @@
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: prometheus-adapter
+  namespace: monitoring
+spec:
+  minAvailable: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/component: metrics-adapter
+      app.kubernetes.io/name: prometheus-adapter

deploy/manifests/role-binding-auth-reader.yaml

@@ -0,0 +1,17 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: resource-metrics-auth-reader
+  namespace: kube-system
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: extension-apiserver-authentication-reader
+subjects:
+- kind: ServiceAccount
+  name: prometheus-adapter
+  namespace: monitoring

deploy/manifests/service-account.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+automountServiceAccountToken: false
+kind: ServiceAccount
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: prometheus-adapter
+  namespace: monitoring

deploy/manifests/service.yaml

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter
+    app.kubernetes.io/version: 0.12.0
+  name: prometheus-adapter
+  namespace: monitoring
+spec:
+  ports:
+  - name: https
+    port: 443
+    targetPort: 6443
+  selector:
+    app.kubernetes.io/component: metrics-adapter
+    app.kubernetes.io/name: prometheus-adapter

docs/config-walkthrough.md

@@ -0,0 +1,230 @@
+Configuration Walkthroughs
+==========================
+
+*If you're looking for reference documentation on configuration, please
+read the [configuration reference](/docs/config.md)*
+
+Per-pod HTTP Requests
+---------------------
+
+### Background
+
+*The [full walkthrough](/docs/walkthrough.md) sets up the background for
+something like this*
+
+Suppose we have some frontend webserver, and we're trying to write a
+configuration for the Prometheus adapter so that we can autoscale it based
+on the HTTP requests per second that it receives.
+
+Before starting, we've gone and instrumented our frontend server with
+a metric, `http_requests_total`.  It is exposed with a single label,
+`method`, breaking down the requests by HTTP verb.
+
+We've configured our Prometheus to collect the metric, and it
+adds the `kubernetes_namespace` and `kubernetes_pod_name` labels,
+representing namespace and pod, respectively.
+
+If we query Prometheus, we see series that look like
+
+```
+http_requests_total{method="GET",kubernetes_namespace="production",kubernetes_pod_name="frontend-server-abcd-0123"}
+```
+
+### Configuring the adapter
+
+The adapter considers metrics in the following ways:
+
+1. First, it discovers the metrics available (*Discovery*)
+
+2. Then, it figures out which Kubernetes resources each metric is
+   associated with (*Association*)
+
+3. Then, it figures out how it should expose them to the custom metrics
+   API (*Naming*)
+
+4. Finally, it figures out how it should query Prometheus to get the
+   actual numbers (*Querying*)
+
+We need to inform the adapter how it should perform each of these steps
+for our metric, `http_requests_total`, so we'll need to add a new
+***rule***. Each rule in the adapter encodes these steps.  Let's add a new
+one to our configuration:
+
+```yaml
+rules:
+- {}
+```
+
+If we want to find all `http_requests_total` series ourselves in the
+Prometheus dashboard, we'd write
+`http_requests_total{kubernetes_namespace!="",kubernetes_pod_name!=""}` to
+find all `http_requests_total` series that were associated with
+a namespace and pod.
+
+We can add this to our rule in the `seriesQuery` field, to tell the
+adapter how *discover* the right series itself:
+
+```yaml
+rules:
+- seriesQuery: 'http_requests_total{kubernetes_namespace!="",kubernetes_pod_name!=""}'
+```
+
+Next, we'll need to tell the adapter how to figure out which Kubernetes
+resources are associated with the metric.  We've already said that
+`kubernetes_namespace` represents the namespace name, and
+`kubernetes_pod_name` represents the pod name.  Since these names don't
+quite follow a consistent pattern, we use the `overrides` section of the
+`resources` field in our rule:
+
+```yaml
+rules:
+- seriesQuery: 'http_requests_total{kubernetes_namespace!="",kubernetes_pod_name!=""}'
+  resources:
+    overrides:
+      kubernetes_namespace: {resource: "namespace"}
+      kubernetes_pod_name: {resource: "pod"}
+```
+
+This says that each label represents its corresponding resource. Since the
+resources are in the "core" kubernetes API, we don't need to specify
+a group.  The adapter will automatically take care of pluralization, so we
+can specify either `pod` or `pods`, just the same way as in `kubectl get`.
+The resources can be any resource available in your kubernetes cluster, as
+long as you've got a corresponding label.
+
+If our labels followed a consistent pattern, like `kubernetes_<resource>`,
+we could specify `resources: {template: "kubernetes_<<.Resource>>"}`
+instead of specifying an override for each resource.  If you want to see
+all resources currently available in your cluster, you can use the
+`kubectl api-resources` command (but the list of available resources can
+change as you add or remove CRDs or aggregated API servers).  For more
+information on resources, see [Kinds, Resources, and
+Scopes](https://github.com/kubernetes-sigs/custom-metrics-apiserver/blob/master/docs/getting-started.md#kinds-resources-and-scopes)
+in the custom-metrics-apiserver boilerplate guide.
+
+Now, cumulative metrics (like those that end in `_total`) aren't
+particularly useful for autoscaling, so we want to convert them to rate
+metrics in the API.  We'll call the rate version of our metric
+`http_requests_per_second`.  We can use the `name` field to tell the
+adapter about that:
+
+```yaml
+rules:
+- seriesQuery: 'http_requests_total{kubernetes_namespace!="",kubernetes_pod_name!=""}'
+  resources:
+    overrides:
+      kubernetes_namespace: {resource: "namespace"}
+      kubernetes_pod_name: {resource: "pod"}
+  name:
+    matches: "^(.*)_total"
+    as: "${1}_per_second"
+```
+
+Here, we've said that we should take the name matching
+`<something>_total`, and turning it into `<something>_per_second`.
+
+Finally, we need to tell the adapter how to actually query Prometheus to
+get some numbers.  Since we want a rate, we might write:
+`sum(rate(http_requests_total{kubernetes_namespace="production",kubernetes_pod_name=~"frontend-server-abcd-0123|fronted-server-abcd-4567"}) by (kubernetes_pod_name)`,
+which would get us the total requests per second for each pod, summed across verbs.
+
+We can write something similar in the adapter, using the `metricsQuery`
+field:
+
+```yaml
+rules:
+- seriesQuery: 'http_requests_total{kubernetes_namespace!="",kubernetes_pod_name!=""}'
+  resources:
+    overrides:
+      kubernetes_namespace: {resource: "namespace"}
+      kubernetes_pod_name: {resource: "pod"}
+  name:
+    matches: "^(.*)_total"
+    as: "${1}_per_second"
+  metricsQuery: 'sum(rate(<<.Series>>{<<.LabelMatchers>>}[2m])) by (<<.GroupBy>>)'
+```
+
+The adapter will automatically fill in the right series name, label
+matchers, and group-by clause, depending on what we put into the API.
+Since we're only working with a single metric anyway, we could replace
+`<<.Series>>` with `http_requests_total`.
+
+Now, if we run an instance of the Prometheus adapter with this
+configuration, we should see discovery information at
+`$KUBERNETES/apis/custom.metrics.k8s.io/v1beta1/` of
+
+```json
+{
+  "kind": "APIResourceList",
+  "apiVersion": "v1",
+  "groupVersion": "custom.metrics.k8s.io/v1beta1",
+  "resources": [
+    {
+      "name": "pods/http_requests_total",
+      "singularName": "",
+      "namespaced": true,
+      "kind": "MetricValueList",
+      "verbs": ["get"]
+    },
+    {
+      "name": "namespaces/http_requests_total",
+      "singularName": "",
+      "namespaced": false,
+      "kind": "MetricValueList",
+      "verbs": ["get"]
+    }
+  ]
+}
+```
+
+Notice that we get an entry for both "pods" and "namespaces" -- the
+adapter exposes the metric on each resource that we've associated the
+metric with (and all namespaced resources must be associated with
+a namespace), and will fill in the `<<.GroupBy>>` section with the
+appropriate label depending on which we ask for.
+
+We can now connect to
+`$KUBERNETES/apis/custom.metrics.k8s.io/v1beta1/namespaces/production/pods/*/http_requests_per_second`,
+and we should see
+
+```json
+{
+  "kind": "MetricValueList",
+  "apiVersion": "custom.metrics.k8s.io/v1beta1",
+  "metadata": {
+    "selfLink": "/apis/custom.metrics.k8s.io/v1beta1/namespaces/production/pods/*/http_requests_per_second",
+  },
+  "items": [
+    {
+      "describedObject": {
+        "kind": "Pod",
+        "name": "frontend-server-abcd-0123",
+        "apiVersion": "/__internal",
+      },
+      "metricName": "http_requests_per_second",
+      "timestamp": "2018-08-07T17:45:22Z",
+      "value": "16m"
+    },
+    {
+      "describedObject": {
+        "kind": "Pod",
+        "name": "frontend-server-abcd-4567",
+        "apiVersion": "/__internal",
+      },
+      "metricName": "http_requests_per_second",
+      "timestamp": "2018-08-07T17:45:22Z",
+      "value": "22m"
+    }
+  ]
+}
+```
+
+This says that our server pods are receiving 16 and 22 milli-requests per
+second (depending on the pod), which is 0.016 and 0.022 requests per
+second, written out as a decimal.  That's about what we'd expect with
+little-to-no traffic except for the Prometheus scrape.
+
+If we added some traffic to our pods, we might see `1` or `20` instead of
+`16m`, which would be `1` or `20` requests per second.  We might also see
+`20500m`, which would mean 20500 milli-requests per second, or 20.5
+requests per second in decimal form.

docs/config.md

@@ -0,0 +1,215 @@
+Metrics Discovery and Presentation Configuration
+================================================
+
+*If you want a full walkthrough of configuring the adapter for a sample
+metric, please read the [configuration
+walkthrough](/docs/config-walkthrough.md)*
+
+The adapter determines which metrics to expose, and how to expose them,
+through a set of "discovery" rules.  Each rule is executed independently
+(so make sure that your rules are mutually exclusive), and specifies each
+of the steps the adapter needs to take to expose a metric in the API.
+
+Each rule can be broken down into roughly four parts:
+
+- *Discovery*, which specifies how the adapter should find all Prometheus
+  metrics for this rule.
+
+- *Association*, which specifies how the adapter should determine which
+  Kubernetes resources a particular metric is associated with.
+
+- *Naming*, which specifies how the adapter should expose the metric in
+  the custom metrics API.
+
+- *Querying*, which specifies how a request for a particular metric on one
+  or more Kubernetes objects should be turned into a query to Prometheus.
+
+A more comprehensive configuration file can be found in
+[sample-config.yaml](sample-config.yaml), but a basic config with one rule
+might look like:
+
+```yaml
+rules:
+# this rule matches cumulative cAdvisor metrics measured in seconds
+- seriesQuery: '{__name__=~"^container_.*",container!="POD",namespace!="",pod!=""}'
+  resources:
+    # skip specifying generic resource<->label mappings, and just
+    # attach only pod and namespace resources by mapping label names to group-resources
+    overrides:
+      namespace: {resource: "namespace"}
+      pod: {resource: "pod"}
+  # specify that the `container_` and `_seconds_total` suffixes should be removed.
+  # this also introduces an implicit filter on metric family names
+  name:
+    # we use the value of the capture group implicitly as the API name
+    # we could also explicitly write `as: "$1"`
+    matches: "^container_(.*)_seconds_total$"
+  # specify how to construct a query to fetch samples for a given series
+  # This is a Go template where the `.Series` and `.LabelMatchers` string values
+  # are available, and the delimiters are `<<` and `>>` to avoid conflicts with
+  # the prometheus query language
+  metricsQuery: "sum(rate(<<.Series>>{<<.LabelMatchers>>,container!="POD"}[2m])) by (<<.GroupBy>>)"
+```
+
+Discovery
+---------
+
+Discovery governs the process of finding the metrics that you want to
+expose in the custom metrics API.  There are two fields that factor into
+discovery: `seriesQuery` and `seriesFilters`.
+
+`seriesQuery` specifies Prometheus series query (as passed to the
+`/api/v1/series` endpoint in Prometheus) to use to find some set of
+Prometheus series.  The adapter will strip the label values from this
+series, and then use the resulting metric-name-label-names combinations
+later on.
+
+In many cases, `seriesQuery` will be sufficient to narrow down the list of
+Prometheus series.  However, sometimes (especially if two rules might
+otherwise overlap), it's useful to do additional filtering on metric
+names.  In this case, `seriesFilters` can be used.  After the list of
+series is returned from `seriesQuery`, each series has its metric name
+filtered through any specified filters.
+
+Filters may be either:
+
+- `is: <regex>`, which matches any series whose name matches the specified
+  regex.
+
+- `isNot: <regex>`, which matches any series whose name does not match the
+  specified regex.
+
+For example:
+
+```yaml
+# match all cAdvisor metrics that aren't measured in seconds
+seriesQuery: '{__name__=~"^container_.*_total",container!="POD",namespace!="",pod!=""}'
+seriesFilters:
+  - isNot: "^container_.*_seconds_total"
+```
+
+Association
+-----------
+
+Association governs the process of figuring out which Kubernetes resources
+a particular metric could be attached to.  The `resources` field controls
+this process.
+
+There are two ways to associate resources with a particular metric.  In
+both cases, the value of the label becomes the name of the particular
+object.
+
+One way is to specify that any label name that matches some particular
+pattern refers to some group-resource based on the label name.  This can
+be done using the `template` field.   The pattern is specified as a Go
+template, with the `Group` and `Resource` fields representing group and
+resource. You don't necessarily have to use the `Group` field (in which
+case the group is guessed by the system). For instance:
+
+```yaml
+# any label `kube_<group>_<resource>` becomes <group>.<resource> in Kubernetes
+resources:
+  template: "kube_<<.Group>>_<<.Resource>>"
+```
+
+The other way is to specify that some particular label represents some
+particular Kubernetes resource.  This can be done using the `overrides`
+field.  Each override maps a Prometheus label to a Kubernetes
+group-resource. For instance:
+
+```yaml
+# the microservice label corresponds to the apps.deployment resource
+resources:
+  overrides:
+    microservice: {group: "apps", resource: "deployment"}
+```
+
+These two can be combined, so you can specify both a template and some
+individual overrides.
+
+The resources mentioned can be any resource available in your kubernetes
+cluster, as long as you've got a corresponding label.
+
+Naming
+------
+
+Naming governs the process of converting a Prometheus metric name into
+a metric in the custom metrics API, and vice versa.  It's controlled by
+the `name` field.
+
+Naming is controlled by specifying a pattern to extract an API name from
+a Prometheus name, and potentially a transformation on that extracted
+value.
+
+The pattern is specified in the `matches` field, and is just a regular
+expression.  If not specified, it defaults to `.*`.
+
+The transformation is specified by the `as` field.  You can use any
+capture groups defined in the `matches` field.  If the `matches` field
+doesn't contain capture groups, the `as` field defaults to `$0`.  If it
+contains a single capture group, the `as` field defautls to `$1`.
+Otherwise, it's an error not to specify the as field.
+
+For example:
+
+```yaml
+# match turn any name <name>_total to <name>_per_second
+# e.g. http_requests_total becomes http_requests_per_second
+name:
+  matches: "^(.*)_total$"
+  as: "${1}_per_second"
+```
+
+Querying
+--------
+
+Querying governs the process of actually fetching values for a particular
+metric.  It's controlled by the `metricsQuery` field.
+
+The `metricsQuery` field is a Go template that gets turned into
+a Prometheus query, using input from a particular call to the custom
+metrics API. A given call to the custom metrics API is distilled down to
+a metric name, a group-resource, and one or more objects of that
+group-resource.  These get turned into the following fields in the
+template:
+
+- `Series`: the metric name
+- `LabelMatchers`: a comma-separated list of label matchers matching the
+  given objects.  Currently, this is the label for the particular
+  group-resource, plus the label for namespace, if the group-resource is
+  namespaced.
+- `GroupBy`: a comma-separated list of labels to group by.  Currently,
+  this contains the group-resource label used in `LabelMatchers`.
+
+For instance, suppose we had a series `http_requests_total` (exposed as
+`http_requests_per_second` in the API) with labels `service`, `pod`,
+`ingress`, `namespace`, and `verb`. The first four correspond to
+Kubernetes resources.  Then, if someone requested the metric
+`pods/http_request_per_second` for the pods `pod1` and `pod2` in the
+`somens` namespace, we'd have:
+
+- `Series: "http_requests_total"`
+- `LabelMatchers: "pod=~\"pod1|pod2",namespace="somens"`
+- `GroupBy`: `pod`
+
+Additionally, there are two advanced fields that are "raw" forms of other
+fields:
+
+- `LabelValuesByName`: a map mapping the labels and values from the
+  `LabelMatchers` field.  The values are pre-joined by `|`
+  (for used with the `=~` matcher in Prometheus).
+- `GroupBySlice`: the slice form of `GroupBy`.
+
+In general, you'll probably want to use the `Series`, `LabelMatchers`, and
+`GroupBy` fields.  The other two are for advanced usage.
+
+The query is expected to return one value for each object requested.  The
+adapter will use the labels on the returned series to associate a given
+series back to its corresponding object.
+
+For example:
+
+```yaml
+# convert cumulative cAdvisor metrics into rates calculated over 2 minutes
+metricsQuery: "sum(rate(<<.Series>>{<<.LabelMatchers>>,container!="POD"}[2m])) by (<<.GroupBy>>)"
+```

docs/externalmetrics.md

@@ -0,0 +1,84 @@
+External Metrics
+===========
+
+It's possible to configure [Autoscaling on metrics not related to Kubernetes objects](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/#autoscaling-on-metrics-not-related-to-kubernetes-objects) in Kubernetes. This is done with a special `External Metrics` system. Using external metrics in Kubernetes with the adapter requires you to configure special `external` rules in the configuration.
+
+The configuration for `external` metrics rules is almost identical to the normal `rules`:
+
+```yaml
+externalRules:
+- seriesQuery: '{__name__="queue_consumer_lag",name!=""}'
+  metricsQuery: sum(<<.Series>>{<<.LabelMatchers>>}) by (name)
+  resources:
+    overrides: { namespace: {resource: "namespace"} }
+```
+
+Namespacing
+-----------
+
+All Kubernetes Horizontal Pod Autoscaler (HPA) resources are namespaced. And when you create an HPA that
+references an external metric the adapter will automatically add a `namespace` label to the `seriesQuery` you have configured.
+
+This is done because the External Merics API Specification *requires* a namespace component in the URL:
+
+```shell
+kubectl get --raw "/apis/external.metrics.k8s.io/v1beta1/namespaces/default/queue_consumer_lag"
+```
+
+Cross-Namespace or No Namespace Queries
+---------------------------------------
+
+A semi-common scenario is to have a `workload` in one namespace that needs to scale based on a metric from a different namespace. This is normally not
+possible with `external` rules because the `namespace` label is set to match that of the source `workload`.
+
+However, you can explicitly disable the automatic add of the HPA namepace to the query, and instead opt to not set a namespace at all, or to target a different namespace.
+
+This is done by setting `namespaced: false` in the `resources` section of the `external` rule:
+
+```yaml
+# rules: ...
+
+externalRules:
+- seriesQuery: '{__name__="queue_depth",name!=""}'
+  metricsQuery: sum(<<.Series>>{<<.LabelMatchers>>}) by (name)
+  resources:
+    namespaced: false
+```
+
+Given the `external` rules defined above any `External` metric query for `queue_depth` will simply ignore the source `namespace` of the HPA. This allows you to explicilty not put a namespace into an external query, or to set the namespace to one that might be different from that of the HPA.
+
+```yaml
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: external-queue-scaler
+  # the HPA and scaleTargetRef must exist in a namespace
+  namespace: default
+  annotations:
+    # The "External" metric below targets a metricName that has namespaced=false
+    # and this allows the metric to explicitly query a different
+    # namespace than that of the HPA and scaleTargetRef
+    autoscaling.alpha.kubernetes.io/metrics: |
+      [
+        {
+            "type": "External",
+            "external": {
+                "metricName": "queue_depth",
+                "metricSelector": {
+                    "matchLabels": {
+                        "namespace": "queue",
+                        "name": "my-sample-queue"
+                    }
+                },
+                "targetAverageValue": "50"
+            }
+        }
+      ]
+spec:
+  maxReplicas: 5
+  minReplicas: 1
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: my-app
+```

docs/format.md

@@ -1,44 +0,0 @@
-Metrics Format and Presentation
-===============================
-
-The adapter gathers the names of available metrics from Prometheus at the
-specified interval.  Only metrics of the following forms are considered:
-
-- "container" metrics (cAdvisor container metrics): series with a name
-  starting with `container_`, as well as non-empty `namespace` and
-  `pod_name` labels.
-
-- "namespaced" metrics (metrics describing namespaced Kubernetes objects):
-  series with non-empty namespace labels (which don't start with
-  `container_`).
-
-*Note*: Currently, metrics on non-namespaced objects (besides namespaces
-themselves) are not supported.
-
-Metrics in Prometheus are converted in the custom-metrics-API metrics as
-follows:
-
-1. The metric name and type are decided:
-   - For container metrics, the `container_` prefix is removed
-   - If the metric has the `_total` suffix, it is marked as a counter
-     metric, and the suffix is removed
-   - If the metric has the `_seconds_total` suffix, it is marked as
-     a seconds counter metric, and the suffix is removed.
-   - If the metric has none of the above suffixes, is is marked as a gauge
-    metric, and the metric name is used as-is
-
-2. Relevant resources are associated with the metric:
-   - container metrics are associated with pods only
-   - for non-container metrics, each label on the series is considered. If
-     that label represents a resource (without the group) available on the
-     server, the metric is associated with that resource.  A metric may be
-     associated with multiple resources.
-
-When retrieving counter and seconds-counter metrics, the adapter requests
-the metrics as a rate over the configured amount of time.  For metrics
-with multiple associated resources, the adapter requests the metric
-aggregated over all non-requested metrics.
-
-The adapter does not consider resources consumed by the "POD" container,
-which exists as part of all Kubernetes pods running in Docker simply
-supports the existance of the pod's shared network namespace.

docs/sample-config.yaml

@@ -0,0 +1,83 @@
+rules:
+# Each rule represents a some naming and discovery logic.
+# Each rule is executed independently of the others, so
+# take care to avoid overlap.  As an optimization, rules
+# with the same `seriesQuery` but different
+# `name` or `seriesFilters` will use only one query to
+# Prometheus for discovery.
+
+# some of these rules are taken from the "default" configuration, which
+# can be found in pkg/config/default.go
+
+# this rule matches cumulative cAdvisor metrics measured in seconds
+- seriesQuery: '{__name__=~"^container_.*",container!="POD",namespace!="",pod!=""}'
+  resources:
+    # skip specifying generic resource<->label mappings, and just
+    # attach only pod and namespace resources by mapping label names to group-resources
+    overrides:
+      namespace: {resource: "namespace"}
+      pod: {resource: "pod"}
+  # specify that the `container_` and `_seconds_total` suffixes should be removed.
+  # this also introduces an implicit filter on metric family names
+  name:
+    # we use the value of the capture group implicitly as the API name
+    # we could also explicitly write `as: "$1"`
+    matches: "^container_(.*)_seconds_total$"
+  # specify how to construct a query to fetch samples for a given series
+  # This is a Go template where the `.Series` and `.LabelMatchers` string values
+  # are available, and the delimiters are `<<` and `>>` to avoid conflicts with
+  # the prometheus query language
+  metricsQuery: "sum(rate(<<.Series>>{<<.LabelMatchers>>,container!="POD"}[2m])) by (<<.GroupBy>>)"
+
+# this rule matches cumulative cAdvisor metrics not measured in seconds
+- seriesQuery: '{__name__=~"^container_.*_total",container!="POD",namespace!="",pod!=""}'
+  resources:
+    overrides:
+      namespace: {resource: "namespace"}
+      pod: {resource: "pod"}
+  seriesFilters:
+  # since this is a superset of the query above, we introduce an additional filter here
+  - isNot: "^container_.*_seconds_total$"
+  name: {matches: "^container_(.*)_total$"}
+  metricsQuery: "sum(rate(<<.Series>>{<<.LabelMatchers>>,container!="POD"}[2m])) by (<<.GroupBy>>)"
+
+# this rule matches cumulative non-cAdvisor metrics
+- seriesQuery: '{namespace!="",__name__!="^container_.*"}'
+  name: {matches: "^(.*)_total$"}
+  resources:
+    # specify an a generic mapping between resources and labels.  This
+    # is a template, like the `metricsQuery` template, except with the `.Group`
+    # and `.Resource` strings available.  It will also be used to match labels,
+    # so avoid using template functions which truncate the group or resource.
+    # Group will be converted to a form acceptible for use as a label automatically.
+    template: "<<.Resource>>"
+    # if we wanted to, we could also specify overrides here
+  metricsQuery: "sum(rate(<<.Series>>{<<.LabelMatchers>>,container!="POD"}[2m])) by (<<.GroupBy>>)"
+
+# this rule matches only a single metric, explicitly naming it something else
+# It's series query *must* return only a single metric family
+- seriesQuery: 'cheddar{sharp="true"}'
+  # this metric will appear as "cheesy_goodness" in the custom metrics API
+  name: {as: "cheesy_goodness"}
+  resources:
+    overrides:
+      # this should still resolve in our cluster
+      brand: {group: "cheese.io", resource: "brand"}
+  metricsQuery: 'count(cheddar{sharp="true"})'
+
+# external rules are not tied to a Kubernetes resource and can reference any metric
+# https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/#autoscaling-on-metrics-not-related-to-kubernetes-objects
+externalRules:
+- seriesQuery: '{__name__="queue_consumer_lag",name!=""}'
+  metricsQuery: sum(<<.Series>>{<<.LabelMatchers>>}) by (name)
+- seriesQuery: '{__name__="queue_depth",topic!=""}'
+  metricsQuery: sum(<<.Series>>{<<.LabelMatchers>>}) by (name)
+  # Kubernetes metric queries include a namespace in the query by default
+  # but you can explicitly disable namespaces if needed with "namespaced: false"
+  # this is useful if you have an HPA with an external metric in namespace A
+  # but want to query for metrics from namespace B
+  resources:
+    namespaced: false
+
+# TODO: should we be able to map to a constant instance of a resource
+# (e.g. `resources: {constant: [{resource: "namespace", name: "kube-system"}}]`)?

docs/walkthrough.md

@@ -8,7 +8,7 @@ metrics sourced from the adapter.
 Prerequisites
 -------------
 
-### Cluster Configuration ###
+### Cluster Configuration
 
 Before getting started, ensure that the main components of your
 cluster are configured for autoscaling on custom metrics.  As of
@@ -20,361 +20,64 @@ Detailed instructions can be found in the Kubernetes documentation under
 [Horizontal Pod
 Autoscaling](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#support-for-custom-metrics).
 
-Make sure that you've properly configured Heapster with the `--api-server`
-flag, otherwise enabling custom metrics autoscaling support with disable
-CPU autoscaling support.
+Make sure that you've properly configured metrics-server (as default in
+Kubernetes 1.9+), or enabling custom metrics autoscaling support will
+disable CPU autoscaling support.
 
-### Binaries and Images ###
+Note that most of the API versions in this walkthrough target Kubernetes
+1.9+.  Note that current versions of the adapter *only* work with
+Kubernetes 1.8+.  Version 0.1.0 works with Kubernetes 1.7, but is
+significantly different.
+
+### Binaries and Images
 
 In order to follow this walkthrough, you'll need container images for
 Prometheus and the custom metrics adapter.
 
-Both can be found on Dockerhub under `prom/prometheus` and
-`directxman12/k8s-prometheus-adapter`, respectively.
+The [Prometheus Operator](https://github.com/prometheus-operator/prometheus-operator),
+makes it easy to get up and running with Prometheus.  This walkthrough
+will assume you're planning on doing that -- if you've deployed it by hand
+instead, you'll need to make a few adjustments to the way you expose
+metrics to Prometheus.
 
-If you're feeling adventurous, you can build the latest version of the
-custom metrics adapter by running `make docker-build`.
+The adapter has different images for each arch, which can be found at
+`gcr.io/k8s-staging-prometheus-adapter/prometheus-adapter-${ARCH}`. For
+instance, if you're on an x86_64 machine, use
+`gcr.io/k8s-staging-prometheus-adapter/prometheus-adapter-amd64` image.
 
-Launching Prometheus and the Adapter
-------------------------------------
+There is also an official multi arch image available at
+`registry.k8s.io/prometheus-adapter/prometheus-adapter:${VERSION}`.
 
-In this walkthrough, it's assumed that you're deploying Prometheus into
-its own namespace called `prom`.  Most of the sample commands and files
-are namespace-agnostic, but there are a few commands that rely on
-namespace.  If you're using a different namespace, simply substitute that
-in for `prom` when it appears.
 
-### Prometheus Configuration ###
+If you're feeling adventurous, you can build the latest version of
+prometheus-adapter by running `make container` or get the latest image from the
+staging registry `gcr.io/k8s-staging-prometheus-adapter/prometheus-adapter`.
 
-If you've never deployed Prometheus before, you'll need an appropriate
-Prometheus configuration.  There's a extensive sample Prometheus
-configuration in the Prometheus repository
-[here](https://github.com/prometheus/prometheus/blob/master/documentation/examples/prometheus-kubernetes.yml).
-Be sure to also read the Prometheus documentation on [configuring
-Prometheus](https://prometheus.io/docs/operating/configuration/).
+Special thanks to [@luxas](https://github.com/luxas) for providing the
+demo application for this walkthrough.
 
-For the purposes of this walkthrough, you'll need the following
-configuration options to be set:
+The Scenario
+------------
 
-<details>
+Suppose that you've written some new web application, and you know it's
+the next best thing since sliced bread.  It's ready to unveil to the
+world... except you're not sure that just one instance will handle all the
+traffic once it goes viral.  Thankfully, you've got Kubernetes.
 
-<summary>prom-cfg.yaml</summary>
-
-```yaml
-# a short scrape interval means you can respond to changes in
-# metrics more quickly
-global:
-  scrape_interval: 15s
-
-# you need a scrape configuration for scraping from pods
-scrape_configs:
-- job_name: 'kubernetes-pods'
-  # if you want to use metrics on jobs, set the below field to
-  # true to prevent Prometheus from setting the `job` label
-  # automatically.
-  honor_labels: false
-  kubernetes_sd_configs:
-  - role: pod
-  # skip verification so you can do HTTPS to pods
-  tls_config:
-    insecure_skip_verify: true
-  # make sure your labels are in order
-  relabel_configs:
-  # these labels tell Prometheus to automatically attach source
-  # pod and namespace information to each collected sample, so
-  # that they'll be exposed in the custom metrics API automatically.
-  - source_labels: [__meta_kubernetes_namespace]
-    action: replace
-    target_label: namespace
-  - source_labels: [__meta_kubernetes_pod_name]
-    action: replace
-    target_label: pod
-  # these labels tell Prometheus to look for
-  # prometheus.io/{scrape,path,port} annotations to configure
-  # how to scrape
-  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
-    action: keep
-    regex: true
-  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
-    action: replace
-    target_label: __metrics_path__
-    regex: (.+)
-  - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
-    action: replace
-    regex: ([^:]+)(?::\d+)?;(\d+)
-    replacement: $1:$2
-    target_label: __address__
-  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scheme]
-    action: replace
-    target_label: __scheme__
-    regex: (.+)
-```
-
-</details>
-
-Place your full configuration (it might just be the above) in a file (call
-it `prom-cfg.yaml`, for example), and then create a ConfigMap containing
-it:
-
-```shell
-$ kubectl -n prom create configmap prometheus --from-file=prometheus.yml=prom-cfg.yaml
-```
-
-You'll be using this later when you launch Prometheus.
-
-### Launching the Deployment ###
-
-It's generally easiest to launch the adapter and Prometheus as two
-containers in the same pod.  You can use a deployment to manage your
-adapter and Prometheus instance.
-
-First, we'll create a ServiceAccount for the deployment to run as:
-
-```yaml
-$ kubectl -n prom create serviceaccount prom-cm-adapter
-```
-
-Start out with a fairly straightforward Prometheus deployment using the
-ConfigMap from above, and proceed from there:
-
-<details>
-
-<summary>prom-adapter.deployment.yaml [Prometheus only]</summary>
-
-```yaml
-apiVersion: apps/v1beta1
-kind: Deployment
-metadata:
-  name: prometheus
-spec:
-  replicas: 1
-  selector:
-    matchLabels:
-      app: prometheus
-  template:
-    metadata:
-      labels:
-        app: prometheus
-    spec:
-      serviceAccountName: prom-cm-adapter 
-      containers:
-      - image: prom/prometheus:v1.6.1
-        name: prometheus
-        args:
-        - -storage.local.retention=6h
-        - -storage.local.memory-chunks=500000
-        # point prometheus at the configuration that you mount in below
-        - -config.file=/etc/prometheus/prometheus.yml
-        ports:
-        # this port exposes the dashboard and the HTTP API
-        - containerPort: 9090
-          name: prom-web
-          protocol: TCP
-        volumeMounts:
-        # you'll mount your ConfigMap volume at /etc/prometheus
-        - mountPath: /etc/prometheus
-          name: prom-config
-      volumes:
-      # make your configmap available as a volume, so that you can
-      # mount in the Prometheus config from earlier
-      - name: config-volume
-        configMap:
-          name: prometheus
-```
-
-</details>
-
-Save this file (for example, as `prom-adapter.deployment.yaml`).  Now,
-you'll need to modify the deployment to include the adapter.
-
-The adapter has several options, most of which it shares with any other
-standard Kubernetes addon API server.  This means that you'll need proper
-API server certificates for it to function properly.  To learn more about
-which certificates are needed, and what they mean, see [Concepts: Auth and
-Certificates](https://github.com/kubernetes-incubator/apiserver-builder/blob/master/docs/concepts/auth.md).
-
-Once you've generated the necessary certificates, you'll need to place
-them in a secret.  This walkthrough assumes that you've set up your
-cluster to automatically inject client certificates and CA certificates
-(see the above concepts documentation).  Make sure you've granted the
-default service account for your namespace permission to fetch the
-authentication CA ConfigMap:
-
-```shell
-$ kubectl create rolebinding prom-ext-auth-reader --role="extension-apiserver-authentication-reader" --serviceaccount=prom:prom-cm-adapter
-```
-
-Then, store your serving certificates in a secret:
-
-```shell
-$ kubectl -n prom create secret tls serving-cm-adapter --cert=/path/to/cm-adapter/serving.crt --key=/path/to/cm-adapter/serving.key
-```
-
-Next, you'll need to make sure that the service account used to launch the
-Deployment has permission to list resources in the cluster:
-
-```shell
-$ kubectl create clusterrole resource-lister --verb=list --resource="*"
-$ kubectl create clusterrolebinding cm-adapter-resource-lister --clusterrole=resource-lister -- serviceaccount=prom:prom-cm-adapter
-```
-
-Finally, ensure the deployment has all the necessary permissions to
-delegate authentication and authorization decisions to the main API
-server.  See [Concepts: Auth and
-Certificates](https://github.com/kubernetes-incubator/apiserver-builder/blob/master/docs/concepts/auth.md)
-for more information.
-
-Next, amend the file above to run the adapter as well.  You may need to
-modify this part if you wish to inject the needed certificates a different
-way.
-
-<details>
-
-<summary>prom-adapter.deployment.yaml [Adapter & Prometheus]</summary>
-
-```yaml
-...
-spec:
-  containers:
-  ...
-  - image: directxman12/k8s-prometheus-adapter
-    name: cm-adapter
-    args:
-    - --secure-port=6443
-    - --logtostderr=true
-    # use your serving certs
-    - --tls-cert-file=/var/run/serving-cert/tls.crt
-    - --tls-private-key-file=/var/run/serving-cert/tls.key
-    # Prometheus is running in the same pod, so you can say your Prometheus
-    # is at `localhost`
-    - --prometheus-url=http://localhost:9090
-    # relist available Prometheus metrics every 1m
-    - --metrics-relist-interval=1m
-    # calculate rates for cumulative metrics over 30s periods.  This should be *at least*
-    # as much as your collection interval for Prometheus.
-    - --rate-interval=30s
-    # re-discover new available resource names every 10m.  You probably
-    # won't need to have this be particularly often, but if you add
-    # additional addons to your cluster, the adapter will discover there
-    # existance at this interval
-    - --discovery-interval=10m
-    - --v=4
-    ports:
-    # this port exposes the custom metrics API
-    - containerPort: 6443
-      name: https
-      protocol: TCP
-    volumeMounts:
-    - mountPath: /var/run/serving-certs
-      name: serving-certs
-      readOnly: true
-  volumes:
-  ...
-  - name: serving-certs
-    secret:
-      secretName: serving-cm-adapter
-```
-
-</details>
-
-Next, create the deployment and expose it as a service, mapping port 443
-to your pod's port 443, on which you've exposed the custom metrics API:
-
-```shell
-$ kubectl -n prom create -f prom-adapter.deployment.yaml
-$ kubectl -n prom create service clusterip prometheus --tcp=443:6443
-```
-
-### Registering the API ###
-
-Now that you have a running deployment of Prometheus and the adapter,
-you'll need to register it as providing the
-`custom-metrics.metrics.k8s.io/v1alpha` API.
-
-For more information on how this works, see [Concepts:
-Aggregation](https://github.com/kubernetes-incubator/apiserver-builder/blob/master/docs/concepts/aggregation.md).
-
-You'll need to create an API registration record for the
-`custom-metrics.metrics.k8s.io/v1alpha1` API.  In order to do this, you'll
-need the base64 encoded version of the CA certificate used to sign the
-serving certificates you created above.  If the CA certificate is stored
-in `/tmp/ca.crt`, you can get the base64-encoded form like this:
-
-```shell
-$ base64 --w 0 < /tmp/ca.crt
-```
-
-Take the resulting value, and place it into the following file:
-
-<details>
-
-<summary>cm-registration.yaml</summary>
-
-```yaml
-apiVersion: apiregistration.k8s.io/v1beta1
-kind: APIService
-metadata:
-  name: v1alpha1.custom-metrics.metrics.k8s.io
-spec:
-  # this tells the aggregator how to verify that your API server is
-  # actually who it claims to be
-  caBundle: <base-64-value-from-above>
-  # these specify which group and version you're registering the API
-  # server for
-  group: custom-metrics.metrics.k8s.io
-  version: v1alpha1
-  # these control how the aggregator prioritizes your registration.
-  # it's not particularly relevant in this case.
-  groupPriorityMinimum: 1000
-  versionPriority: 10
-  # finally, this points the aggregator at the service for your
-  # API server that you created
-  service:
-    name: prometheus
-    namespace: prom
-```
-
-</details>
-
-Register that registration object with the aggregator:
-
-```shell
-$ kubectl -f cm-registration.yaml
-```
-
-### Double-Checking Your Work ###
-
-With that all set, your custom metrics API should show up in discovery.
-
-Try fetching the discovery information for it:
-
-```shell
-$ kubectl get --raw /apis/custom-metrics.metrics.k8s.io/v1alpha1
-```
-
-Since you don't have any metrics collected yet, you shouldn't see any
-available resources, but the request should return successfully.  Keep
-this command in mind -- you'll want to use it later once you have a pod
-producing custom metrics.
-
-Collecting Application Metrics
-------------------------------
-
-Now that you have a working pipeline for ingesting application metrics,
-you'll need an application that produces some metrics.  Any application
-which produces Prometheus-formatted metrics will do.  For the purposes of
-this walkthrough, try out [@luxas](https://github.com/luxas)'s simple HTTP
-counter in the `luxas/autoscale-demo` image on Dockerhub:
+Deploy your app into your cluster, exposed via a service so that you can
+send traffic to it and fetch metrics from it:
 
 <details>
 
 <summary>sample-app.deploy.yaml</summary>
 
 ```yaml
-apiVersion: apps/v1beta1
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: sample-app
+  labels:
+    app: sample-app
 spec:
   replicas: 1
   selector:
@@ -384,81 +87,73 @@ spec:
     metadata:
       labels:
         app: sample-app
-      annotations:
-        # based on your Prometheus config above, this tells prometheus
-        # to scrape this pod for metrics on port 8080 at "/metrics"
-        prometheus.io/scrape: true
-        prometheus.io/port: 8080
-        prometheus.io/path: "/metrics"
     spec:
       containers:
-      - image: luxas/autoscale-demo
+      - image: luxas/autoscale-demo:v0.1.2
         name: metrics-provider
-      ports:
-      - name: http
-        port: 8080
+        ports:
+        - name: http
+          containerPort: 8080
 ```
 
 </details>
 
-Create this deployment, and expose it so that you can easily trigger
-increases in metrics:
+<details>
+
+<summary>sample-app.service.yaml</summary>
 
 ```yaml
-$ kubectl create -f sample-app.deploy.yaml
-$ kubectl create service clusterip sample-app --tcp=80:8080
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: sample-app
+  name: sample-app
+spec:
+  ports:
+  - name: http
+    port: 80
+    protocol: TCP
+    targetPort: 8080
+  selector:
+    app: sample-app
+  type: ClusterIP
 ```
 
-This sample application provides some metrics on the number of HTTP
-requests it receives.  Consider the metric `http_requests_total`.  First,
-check that it appears in discovery using the command from [Double-Checking
-Yor Work](#double-checking-your-work).  The cumulative Prometheus metric
-`http_requests_total` should have become the custom-metrics-API rate
-metric `pods/http_requests`.  Check out its value:
+</details>
 
 ```shell
-$ kubectl get --raw "/apis/custom-metrics.metrics.k8s.io/v1alpha1/namespaces/default/pods/*/http_requests?selector=app%3Dsample-app"
+$ kubectl create -f sample-app.deploy.yaml
+$ kubectl create -f sample-app.service.yaml
 ```
 
-It should be zero, since you're not currently accessing it.  Now, create
-a few requests with curl:
+Now, check your app, which exposes metrics and counts the number of
+accesses to the metrics page via the `http_requests_total` metric:
 
 ```shell
 $ curl http://$(kubectl get service sample-app -o jsonpath='{ .spec.clusterIP }')/metrics
 ```
 
-Try fetching the metrics again.  You should see an increase in the rate
-after the collection interval specified in your Prometheus configuration
-has elapsed.  If you leave it for a bit, the rate will go back down again.
+Notice that each time you access the page, the counter goes up.
 
-Autoscaling
------------
-
-Now that you have an application which produces custom metrics, you'll be
-able to autoscale on it.  As noted in the [HorizontalPodAutoscaler
-walkthrough](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/#autoscaling-on-multiple-metrics-and-custom-metrics),
-there are three different types of metrics that the
-HorizontalPodAutoscaler can handle.
-
-In this walkthrough, you've exposed some metrics that can be consumed
-using the `Pods` metric type.
-
-Create a description for the HorizontalPodAutoscaler (HPA):
+Now, you'll want to make sure you can autoscale your application on that
+metric, so that you're ready for your launch.  You can use
+a HorizontalPodAutoscaler like this to accomplish the autoscaling:
 
 <details>
 
-<summary>sample-app-hpa.yaml</summary>
+<summary>sample-app.hpa.yaml</summary>
 
 ```yaml
 kind: HorizontalPodAutoscaler
-apiVersion: autoscaling/v2alpha1
+apiVersion: autoscaling/v2
 metadata:
   name: sample-app
 spec:
   scaleTargetRef:
     # point the HPA at the sample application
     # you created above
-    apiVersion: apps/v1beta1
+    apiVersion: apps/v1
     kind: Deployment
     name: sample-app
   # autoscale between 1 and 10 replicas
@@ -470,33 +165,290 @@ spec:
   - type: Pods
     pods:
       # use the metric that you used above: pods/http_requests
-      metricName: http_requests
+      metric:
+        name: http_requests
       # target 500 milli-requests per second,
       # which is 1 request every two seconds
-      targetAverageValue: 500m
+      target:
+        type: Value
+        averageValue: 500m
 ```
 
 </details>
 
-Create the HorizontalPodAutoscaler with
+If you try creating that now (and take a look at your controller-manager
+logs), you'll see that the that the HorizontalPodAutoscaler controller is
+attempting to fetch metrics from
+`/apis/custom.metrics.k8s.io/v1beta2/namespaces/default/pods/*/http_requests?selector=app%3Dsample-app`,
+but right now, nothing's serving that API.
 
-```
-$ kubectl create -f sample-app-hpa.yaml
+Before you can autoscale your application, you'll need to make sure that
+Kubernetes can read the metrics that your application exposes.
+
+Launching Prometheus and the Adapter
+------------------------------------
+
+In order to expose metrics beyond CPU and memory to Kubernetes for
+autoscaling, you'll need an "adapter" that serves the custom metrics API.
+Since you've got Prometheus metrics, it makes sense to use the
+Prometheus adapter to serve metrics out of Prometheus.
+
+### Launching Prometheus
+
+First, you'll need to deploy the Prometheus Operator.  Check out the
+[quick start
+guide](https://github.com/prometheus-operator/prometheus-operator#quickstart)
+for the Operator to deploy a copy of Prometheus.
+
+This walkthrough assumes that Prometheus is deployed in the `monitoring`
+namespace. Most of the sample commands and files are namespace-agnostic,
+but there are a few commands or pieces of configuration that rely on that
+namespace.  If you're using a different namespace, simply substitute that
+in for `monitoring` when it appears.
+
+### Monitoring Your Application
+
+In order to monitor your application, you'll need to set up
+a ServiceMonitor pointing at the application.  Assuming you've set up your
+Prometheus instance to use ServiceMonitors with the `app: sample-app`
+label, create a ServiceMonitor to monitor the app's metrics via the
+service:
+
+<details>
+
+<summary>sample-app.monitor.yaml</summary>
+
+```yaml
+kind: ServiceMonitor
+apiVersion: monitoring.coreos.com/v1
+metadata:
+  name: sample-app
+  labels:
+    app: sample-app
+spec:
+  selector:
+    matchLabels:
+      app: sample-app
+  endpoints:
+  - port: http
 ```
 
-Then, like before, make some requests to the sample app's service.  If you
-describe the HPA, after the HPA sync interval has elapsed, you should see
-the number of pods increase proportionally to the ratio between the actual
-requests per second and your target of 1 request every 2 seconds.
+</details>
 
-You can examine the HPA with
+```shell
+$ kubectl create -f sample-app.monitor.yaml
+```
+
+Now, you should see your metrics (`http_requests_total`) appear in your Prometheus instance.  Look
+them up via the dashboard, and make sure they have the `namespace` and
+`pod` labels. If not, check the labels on the service monitor match the ones on the Prometheus CRD.
+
+### Launching the Adapter
+
+Now that you've got a running copy of Prometheus that's monitoring your
+application, you'll need to deploy the adapter, which knows how to
+communicate with both Kubernetes and Prometheus, acting as a translator
+between the two.
+
+The [deploy/manifests](/deploy/manifests) directory contains the
+appropriate files for creating the Kubernetes objects to deploy the
+adapter.
+
+See the [deployment README](/deploy/README.md) for more information about
+the steps to deploy the adapter.  Note that if you're deploying on
+a non-x86_64 (amd64) platform, you'll need to change the `image` field in
+the Deployment to be the appropriate image for your platform.
+
+However an update to the adapter config is necessary in order to
+expose custom metrics.
+
+<details>
+
+<summary>prom-adapter.config.yaml</summary>
+
+```yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: adapter-config
+  namespace: monitoring
+data:
+  config.yaml: |-
+    "rules":
+    - "seriesQuery": |
+         {namespace!="",__name__!~"^container_.*"}
+      "resources":
+        "template": "<<.Resource>>"
+      "name":
+        "matches": "^(.*)_total"
+        "as": ""
+      "metricsQuery": |
+        sum by (<<.GroupBy>>) (
+          irate (
+            <<.Series>>{<<.LabelMatchers>>}[1m]
+          )
+        )
+```
+
+</details>
+
+```shell
+$ kubectl apply -f prom-adapter.config.yaml
+# Restart prom-adapter pods
+$ kubectl rollout restart deployment prometheus-adapter -n monitoring
+```
+
+This adapter configuration should work for this walkthrough together with
+a standard Prometheus Operator configuration, but if you've got custom
+relabelling rules, or your labels above weren't exactly `namespace` and
+`pod`, you may need to edit the configuration in the ConfigMap. The
+[configuration walkthrough](/docs/config-walkthrough.md) provides an
+overview of how configuration works.
+
+### The Registered API
+
+We also need to register the custom metrics API with the API aggregator (part of
+the main Kubernetes API server). For that we need to create an APIService resource
+
+<details>
+
+<summary>api-service.yaml</summary>
+
+```yaml
+apiVersion: apiregistration.k8s.io/v1
+kind: APIService
+metadata:
+  name: v1beta2.custom.metrics.k8s.io
+spec:
+  group: custom.metrics.k8s.io
+  groupPriorityMinimum: 100
+  insecureSkipTLSVerify: true
+  service:
+    name: prometheus-adapter
+    namespace: monitoring
+  version: v1beta2
+  versionPriority: 100
+```
+
+</details>
+
+```shell
+$ kubectl create -f api-service.yaml
+```
+
+The API is registered as `custom.metrics.k8s.io/v1beta2`, and you can find
+more information about aggregation at [Concepts:
+Aggregation](https://github.com/kubernetes-incubator/apiserver-builder/blob/master/docs/concepts/aggregation.md).
+
+### Double-Checking Your Work
+
+With that all set, your custom metrics API should show up in discovery.
+
+Try fetching the discovery information for it:
+
+```shell
+$ kubectl get --raw /apis/custom.metrics.k8s.io/v1beta2
+```
+
+Since you've set up Prometheus to collect your app's metrics, you should
+see a `pods/http_request` resource show up.  This represents the
+`http_requests_total` metric, converted into a rate, aggregated to have
+one datapoint per pod.  Notice that this translates to the same API that
+our HorizontalPodAutoscaler was trying to use above.
+
+You can check the value of the metric using `kubectl get --raw`, which
+sends a raw GET request to the Kubernetes API server, automatically
+injecting auth information:
+
+```shell
+$ kubectl get --raw "/apis/custom.metrics.k8s.io/v1beta2/namespaces/default/pods/*/http_requests?selector=app%3Dsample-app"
+```
+
+Because of the adapter's configuration, the cumulative metric
+`http_requests_total` has been converted into a rate metric,
+`pods/http_requests`, which measures requests per second over a 1 minute
+interval. The value should currently be close to zero, since there's no
+traffic to your app, except for the regular metrics collection from
+Prometheus.
+
+Try generating some traffic using cURL a few times, like before:
+
+```shell
+$ curl http://$(kubectl get service sample-app -o jsonpath='{ .spec.clusterIP }')/metrics
+```
+
+Now, if you fetch the metrics again, you should see an increase in the
+value.  If you leave it alone for a bit, the value should go back down
+again.
+
+### Quantity Values
+
+Notice that the API uses Kubernetes-style quantities to describe metric
+values.  These quantities use SI suffixes instead of decimal points.  The
+most common to see in the metrics API is the `m` suffix, which means
+milli-units, or 1000ths of a unit.  If your metric is exactly a whole
+number of units on the nose, you might not see a suffix. Otherwise, you'll
+probably see an `m` suffix to represent fractions of a unit.
+
+For example, here, `500m` would be half a request per second, `10` would
+be 10 requests per second, and `10500m` would be `10.5` requests per
+second.
+
+### Troubleshooting Missing Metrics
+
+If the metric does not appear, or is not registered with the right
+resources, you might need to modify your [adapter
+configuration](/docs/config.md), as mentioned above.  Check your labels
+via the Prometheus dashboard, and then modify the configuration
+appropriately.
+
+As noted in the main [README](/README.md), you'll need to also make sure
+your metrics relist interval is at least your Prometheus scrape interval.
+If it's less that that, you'll see metrics periodically appear and
+disappear from the adapter.
+
+Autoscaling
+-----------
+
+Now that you finally have the metrics API set up, your
+HorizontalPodAutoscaler should be able to fetch the appropriate metric,
+and make decisions based on it.
+
+If you didn't create the HorizontalPodAutoscaler above, create it now:
+
+```shell
+$ kubectl create -f sample-app.hpa.yaml
+```
+
+Wait a little bit, and then examine the HPA:
 
 ```shell
 $ kubectl describe hpa sample-app
 ```
 
-You should see the HPA's last observed metric value, which should roughly
-correspond to the rate of requests that you made.
+You should see that it succesfully fetched the metric, but it hasn't tried
+to scale, since there's not traffic.
+
+Since your app is going to need to scale in response to traffic, generate
+some via cURL like above:
+
+```shell
+$ curl http://$(kubectl get service sample-app -o jsonpath='{ .spec.clusterIP }')/metrics
+```
+
+Recall from the configuration at the start that you configured your HPA to
+have each replica handle 500 milli-requests, or 1 request every two
+seconds (ok, so *maybe* you still have some performance issues to work out
+before your beta period ends).  Thus, if you generate a few requests, you
+should see the HPA scale up your app relatively quickly.
+
+If you describe the HPA again, you should see that the last observed
+metric value roughly corresponds to your rate of requests, and that the
+HPA has recently scaled your app.
+
+Now that you've got your app autoscaling on the HTTP requests, you're all
+ready to launch! If you leave the app alone for a while, the HPA should
+scale it back down, so you can save precious budget for the launch party.
 
 Next Steps
 ----------
@@ -510,4 +462,5 @@ scaling on application on a metric provided by another application by
 setting different labels or using the `Object` metric source type.
 
 For more information on how metrics are exposed by the Prometheus adapter,
-see the [format documentation](./format.md).
+see [config documentation](/docs/config.md), and check the [default
+configuration](/deploy/manifests/config-map.yaml).

glide.lock

@@ -1,571 +0,0 @@
-hash: 1d2ad16816cec54a2561278dfd05ae9725247ea9b72db5c7d330f0074d069fad
-updated: 2017-09-28T15:22:28.593829441-04:00
-imports:
-- name: bitbucket.org/ww/goautoneg
-  version: 75cd24fc2f2c2a2088577d12123ddee5f54e0675
-- name: github.com/beorn7/perks
-  version: 3ac7bf7a47d159a033b107610db8a1b6575507a4
-  subpackages:
-  - quantile
-- name: github.com/coreos/etcd
-  version: 0520cb9304cb2385f7e72b8bc02d6e4d3257158a
-  subpackages:
-  - alarm
-  - auth
-  - auth/authpb
-  - client
-  - clientv3
-  - compactor
-  - discovery
-  - error
-  - etcdserver
-  - etcdserver/api
-  - etcdserver/api/v2http
-  - etcdserver/api/v2http/httptypes
-  - etcdserver/api/v3rpc
-  - etcdserver/api/v3rpc/rpctypes
-  - etcdserver/auth
-  - etcdserver/etcdserverpb
-  - etcdserver/membership
-  - etcdserver/stats
-  - integration
-  - lease
-  - lease/leasehttp
-  - lease/leasepb
-  - mvcc
-  - mvcc/backend
-  - mvcc/mvccpb
-  - pkg/adt
-  - pkg/contention
-  - pkg/cpuutil
-  - pkg/crc
-  - pkg/fileutil
-  - pkg/httputil
-  - pkg/idutil
-  - pkg/ioutil
-  - pkg/logutil
-  - pkg/monotime
-  - pkg/netutil
-  - pkg/pathutil
-  - pkg/pbutil
-  - pkg/runtime
-  - pkg/schedule
-  - pkg/testutil
-  - pkg/tlsutil
-  - pkg/transport
-  - pkg/types
-  - pkg/wait
-  - proxy/grpcproxy
-  - proxy/grpcproxy/cache
-  - raft
-  - raft/raftpb
-  - rafthttp
-  - snap
-  - snap/snappb
-  - store
-  - version
-  - wal
-  - wal/walpb
-- name: github.com/coreos/go-systemd
-  version: 48702e0da86bd25e76cfef347e2adeb434a0d0a6
-  subpackages:
-  - daemon
-  - journal
-- name: github.com/coreos/pkg
-  version: fa29b1d70f0beaddd4c7021607cc3c3be8ce94b8
-  subpackages:
-  - capnslog
-  - health
-  - httputil
-  - timeutil
-- name: github.com/davecgh/go-spew
-  version: 782f4967f2dc4564575ca782fe2d04090b5faca8
-  subpackages:
-  - spew
-- name: github.com/elazarl/go-bindata-assetfs
-  version: 3dcc96556217539f50599357fb481ac0dc7439b9
-- name: github.com/emicklei/go-restful
-  version: ff4f55a206334ef123e4f79bbf348980da81ca46
-  subpackages:
-  - log
-- name: github.com/emicklei/go-restful-swagger12
-  version: dcef7f55730566d41eae5db10e7d6981829720f6
-- name: github.com/evanphx/json-patch
-  version: 944e07253867aacae43c04b2e6a239005443f33a
-- name: github.com/ghodss/yaml
-  version: 73d445a93680fa1a78ae23a5839bad48f32ba1ee
-- name: github.com/go-openapi/jsonpointer
-  version: 46af16f9f7b149af66e5d1bd010e3574dc06de98
-- name: github.com/go-openapi/jsonreference
-  version: 13c6e3589ad90f49bd3e3bbe2c2cb3d7a4142272
-- name: github.com/go-openapi/spec
-  version: 6aced65f8501fe1217321abf0749d354824ba2ff
-- name: github.com/go-openapi/swag
-  version: 1d0bd113de87027671077d3c71eb3ac5d7dbba72
-- name: github.com/gogo/protobuf
-  version: c0656edd0d9eab7c66d1eb0c568f9039345796f7
-  subpackages:
-  - proto
-  - sortkeys
-- name: github.com/golang/glog
-  version: 44145f04b68cf362d9c4df2182967c2275eaefed
-- name: github.com/golang/protobuf
-  version: 4bd1920723d7b7c925de087aa32e2187708897f7
-  subpackages:
-  - jsonpb
-  - proto
-  - ptypes
-  - ptypes/any
-  - ptypes/duration
-  - ptypes/timestamp
-- name: github.com/google/btree
-  version: 7d79101e329e5a3adf994758c578dab82b90c017
-- name: github.com/google/gofuzz
-  version: 44d81051d367757e1c7c6a5a86423ece9afcf63c
-- name: github.com/googleapis/gnostic
-  version: 0c5108395e2debce0d731cf0287ddf7242066aba
-  subpackages:
-  - OpenAPIv2
-  - compiler
-  - extensions
-- name: github.com/gregjones/httpcache
-  version: 787624de3eb7bd915c329cba748687a3b22666a6
-  subpackages:
-  - diskcache
-- name: github.com/grpc-ecosystem/go-grpc-prometheus
-  version: 2500245aa6110c562d17020fb31a2c133d737799
-- name: github.com/grpc-ecosystem/grpc-gateway
-  version: 84398b94e188ee336f307779b57b3aa91af7063c
-  subpackages:
-  - runtime
-  - runtime/internal
-  - utilities
-- name: github.com/hashicorp/golang-lru
-  version: a0d98a5f288019575c6d1f4bb1573fef2d1fcdc4
-  subpackages:
-  - simplelru
-- name: github.com/howeyc/gopass
-  version: bf9dde6d0d2c004a008c27aaee91170c786f6db8
-- name: github.com/imdario/mergo
-  version: 6633656539c1639d9d78127b7d47c622b5d7b6dc
-- name: github.com/inconshreveable/mousetrap
-  version: 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
-- name: github.com/json-iterator/go
-  version: 36b14963da70d11297d313183d7e6388c8510e1e
-- name: github.com/juju/ratelimit
-  version: 5b9ff866471762aa2ab2dced63c9fb6f53921342
-- name: github.com/kubernetes-incubator/custom-metrics-apiserver
-  version: fae01650d93f5de6151a024e36323344e14427aa
-  subpackages:
-  - pkg/apiserver
-  - pkg/apiserver/installer
-  - pkg/cmd/server
-  - pkg/dynamicmapper
-  - pkg/provider
-  - pkg/registry/custom_metrics
-- name: github.com/mailru/easyjson
-  version: d5b7844b561a7bc640052f1b935f7b800330d7e0
-  subpackages:
-  - buffer
-  - jlexer
-  - jwriter
-- name: github.com/matttproud/golang_protobuf_extensions
-  version: fc2b8d3a73c4867e51861bbdd5ae3c1f0869dd6a
-  subpackages:
-  - pbutil
-- name: github.com/mxk/go-flowrate
-  version: cca7078d478f8520f85629ad7c68962d31ed7682
-  subpackages:
-  - flowrate
-- name: github.com/NYTimes/gziphandler
-  version: 56545f4a5d46df9a6648819d1664c3a03a13ffdb
-- name: github.com/pborman/uuid
-  version: ca53cad383cad2479bbba7f7a1a05797ec1386e4
-- name: github.com/peterbourgon/diskv
-  version: 5f041e8faa004a95c88a202771f4cc3e991971e6
-- name: github.com/pkg/errors
-  version: a22138067af1c4942683050411a841ade67fe1eb
-- name: github.com/prometheus/client_golang
-  version: e7e903064f5e9eb5da98208bae10b475d4db0f8c
-  subpackages:
-  - prometheus
-- name: github.com/prometheus/client_model
-  version: fa8ad6fec33561be4280a8f0514318c79d7f6cb6
-  subpackages:
-  - go
-- name: github.com/prometheus/common
-  version: 13ba4ddd0caa9c28ca7b7bffe1dfa9ed8d5ef207
-  subpackages:
-  - expfmt
-  - internal/bitbucket.org/ww/goautoneg
-  - model
-- name: github.com/prometheus/procfs
-  version: 65c1f6f8f0fc1e2185eb9863a3bc751496404259
-  subpackages:
-  - xfs
-- name: github.com/PuerkitoBio/purell
-  version: 8a290539e2e8629dbc4e6bad948158f790ec31f4
-- name: github.com/PuerkitoBio/urlesc
-  version: 5bd2802263f21d8788851d5305584c82a5c75d7e
-- name: github.com/spf13/cobra
-  version: f62e98d28ab7ad31d707ba837a966378465c7b57
-- name: github.com/spf13/pflag
-  version: 9ff6c6923cfffbcd502984b8e0c80539a94968b7
-- name: github.com/stretchr/testify
-  version: 69483b4bd14f5845b5a1e55bca19e954e827f1d0
-  subpackages:
-  - assert
-  - require
-- name: github.com/ugorji/go
-  version: ded73eae5db7e7a0ef6f55aace87a2873c5d2b74
-  subpackages:
-  - codec
-- name: golang.org/x/crypto
-  version: 81e90905daefcd6fd217b62423c0908922eadb30
-  subpackages:
-  - bcrypt
-  - blowfish
-  - nacl/secretbox
-  - poly1305
-  - salsa20/salsa
-  - ssh/terminal
-- name: golang.org/x/net
-  version: 1c05540f6879653db88113bc4a2b70aec4bd491f
-  subpackages:
-  - context
-  - html
-  - html/atom
-  - http2
-  - http2/hpack
-  - idna
-  - internal/timeseries
-  - lex/httplex
-  - trace
-  - websocket
-- name: golang.org/x/sys
-  version: 7ddbeae9ae08c6a06a59597f0c9edbc5ff2444ce
-  subpackages:
-  - unix
-  - windows
-- name: golang.org/x/text
-  version: b19bf474d317b857955b12035d2c5acb57ce8b01
-  subpackages:
-  - cases
-  - internal
-  - internal/tag
-  - language
-  - runes
-  - secure/bidirule
-  - secure/precis
-  - transform
-  - unicode/bidi
-  - unicode/norm
-  - width
-- name: google.golang.org/genproto
-  version: 09f6ed296fc66555a25fe4ce95173148778dfa85
-  subpackages:
-  - googleapis/rpc/status
-- name: google.golang.org/grpc
-  version: d2e1b51f33ff8c5e4a15560ff049d200e83726c5
-  subpackages:
-  - codes
-  - credentials
-  - grpclb/grpc_lb_v1
-  - grpclog
-  - internal
-  - keepalive
-  - metadata
-  - naming
-  - peer
-  - stats
-  - status
-  - tap
-  - transport
-- name: gopkg.in/inf.v0
-  version: 3887ee99ecf07df5b447e9b00d9c0b2adaa9f3e4
-- name: gopkg.in/natefinch/lumberjack.v2
-  version: 20b71e5b60d756d3d2f80def009790325acc2b23
-- name: gopkg.in/yaml.v2
-  version: 53feefa2559fb8dfa8d81baad31be332c97d6c77
-- name: k8s.io/api
-  version: cadaf100c0a3dd6b254f320d6d651df079ec8e0a
-  subpackages:
-  - admissionregistration/v1alpha1
-  - apps/v1beta1
-  - apps/v1beta2
-  - authentication/v1
-  - authentication/v1beta1
-  - authorization/v1
-  - authorization/v1beta1
-  - autoscaling/v1
-  - autoscaling/v2beta1
-  - batch/v1
-  - batch/v1beta1
-  - batch/v2alpha1
-  - certificates/v1beta1
-  - core/v1
-  - extensions/v1beta1
-  - networking/v1
-  - policy/v1beta1
-  - rbac/v1
-  - rbac/v1alpha1
-  - rbac/v1beta1
-  - scheduling/v1alpha1
-  - settings/v1alpha1
-  - storage/v1
-  - storage/v1beta1
-- name: k8s.io/apimachinery
-  version: 3b05bbfa0a45413bfa184edbf9af617e277962fb
-  subpackages:
-  - pkg/api/equality
-  - pkg/api/errors
-  - pkg/api/meta
-  - pkg/api/resource
-  - pkg/api/validation
-  - pkg/api/validation/path
-  - pkg/apimachinery
-  - pkg/apimachinery/announced
-  - pkg/apimachinery/registered
-  - pkg/apis/meta/internalversion
-  - pkg/apis/meta/v1
-  - pkg/apis/meta/v1/unstructured
-  - pkg/apis/meta/v1/validation
-  - pkg/apis/meta/v1alpha1
-  - pkg/conversion
-  - pkg/conversion/queryparams
-  - pkg/conversion/unstructured
-  - pkg/fields
-  - pkg/labels
-  - pkg/runtime
-  - pkg/runtime/schema
-  - pkg/runtime/serializer
-  - pkg/runtime/serializer/json
-  - pkg/runtime/serializer/protobuf
-  - pkg/runtime/serializer/recognizer
-  - pkg/runtime/serializer/streaming
-  - pkg/runtime/serializer/versioning
-  - pkg/selection
-  - pkg/types
-  - pkg/util/cache
-  - pkg/util/clock
-  - pkg/util/diff
-  - pkg/util/errors
-  - pkg/util/framer
-  - pkg/util/httpstream
-  - pkg/util/intstr
-  - pkg/util/json
-  - pkg/util/mergepatch
-  - pkg/util/net
-  - pkg/util/proxy
-  - pkg/util/rand
-  - pkg/util/runtime
-  - pkg/util/sets
-  - pkg/util/strategicpatch
-  - pkg/util/uuid
-  - pkg/util/validation
-  - pkg/util/validation/field
-  - pkg/util/wait
-  - pkg/util/yaml
-  - pkg/version
-  - pkg/watch
-  - third_party/forked/golang/json
-  - third_party/forked/golang/netutil
-  - third_party/forked/golang/reflect
-- name: k8s.io/apiserver
-  version: c1e53d745d0fe45bf7d5d44697e6eface25fceca
-  subpackages:
-  - pkg/admission
-  - pkg/admission/initializer
-  - pkg/admission/plugin/namespace/lifecycle
-  - pkg/apis/apiserver
-  - pkg/apis/apiserver/install
-  - pkg/apis/apiserver/v1alpha1
-  - pkg/apis/audit
-  - pkg/apis/audit/install
-  - pkg/apis/audit/v1alpha1
-  - pkg/apis/audit/v1beta1
-  - pkg/apis/audit/validation
-  - pkg/audit
-  - pkg/audit/policy
-  - pkg/authentication/authenticator
-  - pkg/authentication/authenticatorfactory
-  - pkg/authentication/group
-  - pkg/authentication/request/anonymous
-  - pkg/authentication/request/bearertoken
-  - pkg/authentication/request/headerrequest
-  - pkg/authentication/request/union
-  - pkg/authentication/request/websocket
-  - pkg/authentication/request/x509
-  - pkg/authentication/serviceaccount
-  - pkg/authentication/token/tokenfile
-  - pkg/authentication/user
-  - pkg/authorization/authorizer
-  - pkg/authorization/authorizerfactory
-  - pkg/authorization/union
-  - pkg/endpoints
-  - pkg/endpoints/discovery
-  - pkg/endpoints/filters
-  - pkg/endpoints/handlers
-  - pkg/endpoints/handlers/negotiation
-  - pkg/endpoints/handlers/responsewriters
-  - pkg/endpoints/metrics
-  - pkg/endpoints/openapi
-  - pkg/endpoints/request
-  - pkg/features
-  - pkg/registry/generic
-  - pkg/registry/generic/registry
-  - pkg/registry/rest
-  - pkg/server
-  - pkg/server/filters
-  - pkg/server/healthz
-  - pkg/server/httplog
-  - pkg/server/mux
-  - pkg/server/options
-  - pkg/server/routes
-  - pkg/server/routes/data/swagger
-  - pkg/server/storage
-  - pkg/storage
-  - pkg/storage/errors
-  - pkg/storage/etcd
-  - pkg/storage/etcd/metrics
-  - pkg/storage/etcd/util
-  - pkg/storage/etcd3
-  - pkg/storage/etcd3/preflight
-  - pkg/storage/names
-  - pkg/storage/storagebackend
-  - pkg/storage/storagebackend/factory
-  - pkg/storage/value
-  - pkg/util/feature
-  - pkg/util/flag
-  - pkg/util/flushwriter
-  - pkg/util/logs
-  - pkg/util/trace
-  - pkg/util/webhook
-  - pkg/util/wsstream
-  - plugin/pkg/audit/log
-  - plugin/pkg/audit/webhook
-  - plugin/pkg/authenticator/token/webhook
-  - plugin/pkg/authorizer/webhook
-- name: k8s.io/client-go
-  version: 82aa063804cf055e16e8911250f888bc216e8b61
-  subpackages:
-  - discovery
-  - dynamic
-  - dynamic/fake
-  - informers
-  - informers/admissionregistration
-  - informers/admissionregistration/v1alpha1
-  - informers/apps
-  - informers/apps/v1beta1
-  - informers/apps/v1beta2
-  - informers/autoscaling
-  - informers/autoscaling/v1
-  - informers/autoscaling/v2beta1
-  - informers/batch
-  - informers/batch/v1
-  - informers/batch/v1beta1
-  - informers/batch/v2alpha1
-  - informers/certificates
-  - informers/certificates/v1beta1
-  - informers/core
-  - informers/core/v1
-  - informers/extensions
-  - informers/extensions/v1beta1
-  - informers/internalinterfaces
-  - informers/networking
-  - informers/networking/v1
-  - informers/policy
-  - informers/policy/v1beta1
-  - informers/rbac
-  - informers/rbac/v1
-  - informers/rbac/v1alpha1
-  - informers/rbac/v1beta1
-  - informers/scheduling
-  - informers/scheduling/v1alpha1
-  - informers/settings
-  - informers/settings/v1alpha1
-  - informers/storage
-  - informers/storage/v1
-  - informers/storage/v1beta1
-  - kubernetes
-  - kubernetes/scheme
-  - kubernetes/typed/admissionregistration/v1alpha1
-  - kubernetes/typed/apps/v1beta1
-  - kubernetes/typed/apps/v1beta2
-  - kubernetes/typed/authentication/v1
-  - kubernetes/typed/authentication/v1beta1
-  - kubernetes/typed/authorization/v1
-  - kubernetes/typed/authorization/v1beta1
-  - kubernetes/typed/autoscaling/v1
-  - kubernetes/typed/autoscaling/v2beta1
-  - kubernetes/typed/batch/v1
-  - kubernetes/typed/batch/v1beta1
-  - kubernetes/typed/batch/v2alpha1
-  - kubernetes/typed/certificates/v1beta1
-  - kubernetes/typed/core/v1
-  - kubernetes/typed/extensions/v1beta1
-  - kubernetes/typed/networking/v1
-  - kubernetes/typed/policy/v1beta1
-  - kubernetes/typed/rbac/v1
-  - kubernetes/typed/rbac/v1alpha1
-  - kubernetes/typed/rbac/v1beta1
-  - kubernetes/typed/scheduling/v1alpha1
-  - kubernetes/typed/settings/v1alpha1
-  - kubernetes/typed/storage/v1
-  - kubernetes/typed/storage/v1beta1
-  - listers/admissionregistration/v1alpha1
-  - listers/apps/v1beta1
-  - listers/apps/v1beta2
-  - listers/autoscaling/v1
-  - listers/autoscaling/v2beta1
-  - listers/batch/v1
-  - listers/batch/v1beta1
-  - listers/batch/v2alpha1
-  - listers/certificates/v1beta1
-  - listers/core/v1
-  - listers/extensions/v1beta1
-  - listers/networking/v1
-  - listers/policy/v1beta1
-  - listers/rbac/v1
-  - listers/rbac/v1alpha1
-  - listers/rbac/v1beta1
-  - listers/scheduling/v1alpha1
-  - listers/settings/v1alpha1
-  - listers/storage/v1
-  - listers/storage/v1beta1
-  - pkg/version
-  - rest
-  - rest/watch
-  - testing
-  - tools/auth
-  - tools/cache
-  - tools/clientcmd
-  - tools/clientcmd/api
-  - tools/clientcmd/api/latest
-  - tools/clientcmd/api/v1
-  - tools/metrics
-  - tools/pager
-  - tools/reference
-  - transport
-  - util/cert
-  - util/flowcontrol
-  - util/homedir
-  - util/integer
-- name: k8s.io/kube-openapi
-  version: 868f2f29720b192240e18284659231b440f9cda5
-  subpackages:
-  - pkg/builder
-  - pkg/common
-  - pkg/handler
-  - pkg/util
-- name: k8s.io/metrics
-  version: 4c7ac522b9daf7beeb53f6766722ba78b7e5712d
-  subpackages:
-  - pkg/apis/custom_metrics
-  - pkg/apis/custom_metrics/install
-  - pkg/apis/custom_metrics/v1beta1
-testImports:
-- name: github.com/pmezard/go-difflib
-  version: d8ed2627bdf02c080bf22230dbb337003b7aba2d
-  subpackages:
-  - difflib

glide.yaml

@@ -1,23 +0,0 @@
-package: github.com/directxman12/k8s-prometheus-adapter
-import:
-- package: github.com/spf13/cobra
-- package: k8s.io/apimachinery
-  subpackages:
-  - pkg/util/wait
-- package: k8s.io/apiserver
-  subpackages:
-  - pkg/util/logs
-- package: k8s.io/client-go
-  subpackages:
-  - kubernetes/typed/core/v1
-  - rest
-  - tools/clientcmd
-- package: github.com/kubernetes-incubator/custom-metrics-apiserver
-  subpackages:
-  - pkg/cmd/server
-  - pkg/provider
-- package: github.com/stretchr/testify
-  version: ^1.1.4
-  subpackages:
-  - assert
-  - require

go.mod

@@ -0,0 +1,118 @@
+module sigs.k8s.io/prometheus-adapter
+
+go 1.22.1
+
+toolchain go1.22.2
+
+require (
+	github.com/onsi/ginkgo v1.16.5
+	github.com/onsi/gomega v1.33.1
+	github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring v0.73.2
+	github.com/prometheus-operator/prometheus-operator/pkg/client v0.73.2
+	github.com/prometheus/client_golang v1.18.0
+	github.com/prometheus/common v0.46.0
+	github.com/spf13/cobra v1.8.0
+	github.com/stretchr/testify v1.9.0
+	gopkg.in/yaml.v2 v2.4.0
+	k8s.io/api v0.30.0
+	k8s.io/apimachinery v0.30.0
+	k8s.io/apiserver v0.30.0
+	k8s.io/client-go v0.30.0
+	k8s.io/component-base v0.30.0
+	k8s.io/klog/v2 v2.120.1
+	k8s.io/kube-openapi v0.0.0-20240430033511-f0e62f92d13f
+	k8s.io/metrics v0.30.0
+	sigs.k8s.io/custom-metrics-apiserver v1.30.0
+	sigs.k8s.io/metrics-server v0.7.1
+)
+
+require (
+	github.com/NYTimes/gziphandler v1.1.1 // indirect
+	github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df // indirect
+	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/blang/semver/v4 v4.0.0 // indirect
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/coreos/go-semver v0.3.1 // indirect
+	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/emicklei/go-restful/v3 v3.12.0 // indirect
+	github.com/evanphx/json-patch v5.9.0+incompatible // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.21.0 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/cel-go v0.17.8 // indirect
+	github.com/google/gnostic-models v0.6.8 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.18.1 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/nxadm/tail v1.4.8 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/stoewer/go-strcase v1.3.0 // indirect
+	go.etcd.io/etcd/api/v3 v3.5.11 // indirect
+	go.etcd.io/etcd/client/pkg/v3 v3.5.11 // indirect
+	go.etcd.io/etcd/client/v3 v3.5.11 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.46.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.1 // indirect
+	go.opentelemetry.io/otel v1.21.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.21.0 // indirect
+	go.opentelemetry.io/otel/metric v1.21.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.21.0 // indirect
+	go.opentelemetry.io/otel/trace v1.21.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.0.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.26.0 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
+	golang.org/x/exp v0.0.0-20231226003508-02704c960a9b // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/oauth2 v0.18.0 // indirect
+	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/term v0.27.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	golang.org/x/time v0.5.0 // indirect
+	golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d // indirect
+	google.golang.org/appengine v1.6.8 // indirect
+	google.golang.org/genproto v0.0.0-20231212172506-995d672761c0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20231212172506-995d672761c0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20231212172506-995d672761c0 // indirect
+	google.golang.org/grpc v1.60.1 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/apiextensions-apiserver v0.29.3 // indirect
+	k8s.io/gengo/v2 v2.0.0-20240228010128-51d4e06bde70 // indirect
+	k8s.io/kms v0.30.0 // indirect
+	k8s.io/utils v0.0.0-20240423183400-0849a56e8f22 // indirect
+	sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.29.0 // indirect
+	sigs.k8s.io/controller-runtime v0.17.2 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
+	sigs.k8s.io/yaml v1.4.0 // indirect
+)

go.sum

@@ -0,0 +1,383 @@
+cloud.google.com/go v0.111.0 h1:YHLKNupSD1KqjDbQ3+LVdQ81h/UJbJyZG203cEfnQgM=
+cloud.google.com/go/compute v1.23.3 h1:6sVlXXBmbd7jNX0Ipq0trII3e4n1/MsADLK6a+aiVlk=
+cloud.google.com/go/compute v1.23.3/go.mod h1:VCgBUoMnIVIR0CscqQiPJLAG25E3ZRZMzcFZeQ+h8CI=
+cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
+cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
+github.com/NYTimes/gziphandler v1.1.1 h1:ZUDjpQae29j0ryrS0u/B8HZfJBtBQHjqw2rQ2cqUQ3I=
+github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
+github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df h1:7RFfzj4SSt6nnvCPbCqijJi1nWCd+TqAT3bYCStRC18=
+github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df/go.mod h1:pSwJ0fSY5KhvocuWSx4fz3BA8OrA1bQn+K1Eli3BRwM=
+github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
+github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
+github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
+github.com/cenkalti/backoff/v4 v4.2.1 h1:y4OZtCnogmCPw98Zjyt5a6+QwPLGkiQsYW5oUqylYbM=
+github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cncf/xds/go v0.0.0-20230607035331-e9ce68804cb4 h1:/inchEIKaYC1Akx+H+gqO04wryn5h75LSazbRlnya1k=
+github.com/cncf/xds/go v0.0.0-20230607035331-e9ce68804cb4/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr4=
+github.com/coreos/go-semver v0.3.1/go.mod h1:irMmmIw/7yzSRPWryHsK7EYSg09caPQL03VsM8rvUec=
+github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=
+github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/emicklei/go-restful/v3 v3.12.0 h1:y2DdzBAURM29NFF94q6RaY4vjIH1rtwDapwQtU84iWk=
+github.com/emicklei/go-restful/v3 v3.12.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
+github.com/envoyproxy/protoc-gen-validate v1.0.2 h1:QkIBuU5k+x7/QXPvPPnWXWlCdaBFApVqftFV6k087DA=
+github.com/envoyproxy/protoc-gen-validate v1.0.2/go.mod h1:GpiZQP3dDbg4JouG/NNS7QWXpgx6x8QiMKdmN72jogE=
+github.com/evanphx/json-patch v5.9.0+incompatible h1:fBXyNpNMuTTDdquAq/uisOr2lShz4oaXpDTX2bLe7ls=
+github.com/evanphx/json-patch v5.9.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
+github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
+github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
+github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/go-logr/zapr v1.3.0 h1:XGdV8XW8zdwFiwOA2Dryh1gj2KRQyOOoNmBy4EplIcQ=
+github.com/go-logr/zapr v1.3.0/go.mod h1:YKepepNBd1u/oyhd/yQmtjVXmm9uML4IXUgMOwR8/Gg=
+github.com/go-openapi/jsonpointer v0.21.0 h1:YgdVicSA9vH5RiHs9TZW5oyafXZFc6+2Vc1rr/O9oNQ=
+github.com/go-openapi/jsonpointer v0.21.0/go.mod h1:IUyH9l/+uyhIYQ/PXVA41Rexl+kOkAPDdXEYns6fzUY=
+github.com/go-openapi/jsonreference v0.21.0 h1:Rs+Y7hSXT83Jacb7kFyjn4ijOuVGSvOdF2+tg1TRrwQ=
+github.com/go-openapi/jsonreference v0.21.0/go.mod h1:LmZmgsrTkVg9LG4EaHeY8cBDslNPMo06cago5JNLkm4=
+github.com/go-openapi/swag v0.23.0 h1:vsEVJDUo2hPJ2tu0/Xc+4noaxyEffXNIs3cOULZ+GrE=
+github.com/go-openapi/swag v0.23.0/go.mod h1:esZ8ITTYEsH1V2trKHjAN8Ai7xHb8RV+YSZ577vPjgQ=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
+github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
+github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
+github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
+github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/golang-jwt/jwt/v4 v4.5.0 h1:7cYmW1XlMY7h7ii7UhUyChSgS5wUJEnm9uZVTGqOWzg=
+github.com/golang-jwt/jwt/v4 v4.5.0/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
+github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
+github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
+github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
+github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
+github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
+github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
+github.com/google/btree v1.0.1 h1:gK4Kx5IaGY9CD5sPJ36FHiBJ6ZXl0kilRiiCj+jdYp4=
+github.com/google/btree v1.0.1/go.mod h1:xXMiIv4Fb/0kKde4SpL7qlzvu5cMJDRkFDxJfI9uaxA=
+github.com/google/cel-go v0.17.8 h1:j9m730pMZt1Fc4oKhCLUHfjj6527LuhYcYw0Rl8gqto=
+github.com/google/cel-go v0.17.8/go.mod h1:HXZKzB0LXqer5lHHgfWAnlYwJaQBDKMjxjulNQzhwhY=
+github.com/google/gnostic-models v0.6.8 h1:yo/ABAfM5IMRsS1VnXjTBvUb61tFIHozhlYvRgGre9I=
+github.com/google/gnostic-models v0.6.8/go.mod h1:5n7qKqH0f5wFt+aWF8CW6pZLLNOfYuF5OpfBSENuI8U=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/gofuzz v1.2.0 h1:xRy4A+RhZaiKjJ1bPfwQ8sedCA+YS2YcCHW6ec7JMi0=
+github.com/google/gofuzz v1.2.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/pprof v0.0.0-20240424215950-a892ee059fd6 h1:k7nVchz72niMH6YLQNvHSdIE7iqsQxK1P41mySCvssg=
+github.com/google/pprof v0.0.0-20240424215950-a892ee059fd6/go.mod h1:kf6iHlnVGwgKolg33glAes7Yg/8iWP8ukqeldJSO7jw=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/grpc-ecosystem/go-grpc-middleware v1.3.0 h1:+9834+KizmvFV7pXQGSXQTsaWhq2GjuNUt0aUU0YBYw=
+github.com/grpc-ecosystem/go-grpc-middleware v1.3.0/go.mod h1:z0ButlSOZa5vEBq9m2m2hlwIgKw+rp3sdCBRoJY+30Y=
+github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 h1:Ovs26xHkKqVztRpIrF/92BcuyuQ/YW4NSIpoGtfXNho=
+github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
+github.com/grpc-ecosystem/grpc-gateway v1.16.0 h1:gmcG1KaJ57LophUzW0Hy8NmPhnMZb4M0+kPpLofRdBo=
+github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.18.1 h1:6UKoz5ujsI55KNpsJH3UwCq3T8kKbZwNZBNPuTTje8U=
+github.com/grpc-ecosystem/grpc-gateway/v2 v2.18.1/go.mod h1:YvJ2f6MplWDhfxiUC3KpyTy76kYUZA4W3pTv/wdKQ9Y=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/imdario/mergo v0.3.16 h1:wwQJbIsHYGMUyLSPrEq1CT16AhnhNJQ51+4fdHUnCl4=
+github.com/imdario/mergo v0.3.16/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/jonboulle/clockwork v0.2.2 h1:UOGuzwb1PwsrDAObMuhUnj0p5ULPj8V/xJ7Kx9qUBdQ=
+github.com/jonboulle/clockwork v0.2.2/go.mod h1:Pkfl5aHPm1nk2H9h0bjmnJD/BcgbGXUBGnn1kMkgxc8=
+github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
+github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
+github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
+github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
+github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
+github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
+github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
+github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
+github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
+github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
+github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/ginkgo v1.12.1/go.mod h1:zj2OWP4+oCPe1qIXoGWkgMRwljMUYCdkwsT2108oapk=
+github.com/onsi/ginkgo v1.16.5 h1:8xi0RTUf59SOSfEtZMvwTvXYMzG4gV23XVHOZiXNtnE=
+github.com/onsi/ginkgo v1.16.5/go.mod h1:+E8gABHa3K6zRBolWtd+ROzc/U5bkGt0FwiG042wbpU=
+github.com/onsi/ginkgo/v2 v2.17.2 h1:7eMhcy3GimbsA3hEnVKdw/PQM9XN9krpKVXsZdph0/g=
+github.com/onsi/ginkgo/v2 v2.17.2/go.mod h1:nP2DPOQoNsQmsVyv5rDA8JkXQoCs6goXIvr/PRJ1eCc=
+github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
+github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
+github.com/onsi/gomega v1.33.1 h1:dsYjIxxSR755MDmKVsaFQTE22ChNBcuuTWgkUDSubOk=
+github.com/onsi/gomega v1.33.1/go.mod h1:U4R44UsT+9eLIaYRB2a5qajjtQYn0hauxvRm16AVYg0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
+github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring v0.73.2 h1:GwlGJPK6vf1UIohpc72KJVkKYlzki1UgE3xC4bWbf20=
+github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring v0.73.2/go.mod h1:yJ3CawR/A5qEYFEeCOUVYLTwYxmacfHQhJS+b/2QiaM=
+github.com/prometheus-operator/prometheus-operator/pkg/client v0.73.2 h1:cKSYjDjk9Rn/VIFKCh+CCd771ip7VTJzA3fAuKTxY2Q=
+github.com/prometheus-operator/prometheus-operator/pkg/client v0.73.2/go.mod h1:mkLwGPvmexoEm6j3bk8gkWNIIFzN2uCs9tRFU2Vsu/I=
+github.com/prometheus/client_golang v1.18.0 h1:HzFfmkOzH5Q8L8G+kSJKUx5dtG87sewO+FoDDqP5Tbk=
+github.com/prometheus/client_golang v1.18.0/go.mod h1:T+GXkCk5wSJyOqMIzVgvvjFDlkOQntgjkJWKrN5txjA=
+github.com/prometheus/client_model v0.5.0 h1:VQw1hfvPvk3Uv6Qf29VrPF32JB6rtbgI6cYPYQjL0Qw=
+github.com/prometheus/client_model v0.5.0/go.mod h1:dTiFglRmd66nLR9Pv9f0mZi7B7fk5Pm3gvsjB5tr+kI=
+github.com/prometheus/common v0.46.0 h1:doXzt5ybi1HBKpsZOL0sSkaNHJJqkyfEWZGGqqScV0Y=
+github.com/prometheus/common v0.46.0/go.mod h1:Tp0qkxpb9Jsg54QMe+EAmqXkSV7Evdy1BTn+g2pa/hQ=
+github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
+github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
+github.com/rogpeppe/go-internal v1.11.0 h1:cWPaGQEPrBb5/AsnsZesgZZ9yb1OQ+GOISoDNXVBh4M=
+github.com/rogpeppe/go-internal v1.11.0/go.mod h1:ddIwULY96R17DhadqLgMfk9H9tvdUzkipdSkR5nkCZA=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=
+github.com/sirupsen/logrus v1.9.0/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/soheilhy/cmux v0.1.5 h1:jjzc5WVemNEDTLwv9tlmemhC73tI08BNOIGwBOo10Js=
+github.com/soheilhy/cmux v0.1.5/go.mod h1:T7TcVDs9LWfQgPlPsdngu6I6QIoyIFZDDC6sNE1GqG0=
+github.com/spf13/cobra v1.8.0 h1:7aJaZx1B85qltLMc546zn58BxxfZdR/W22ej9CFoEf0=
+github.com/spf13/cobra v1.8.0/go.mod h1:WXLWApfZ71AjXPya3WOlMsY9yMs7YeiHhFVlvLyhcho=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stoewer/go-strcase v1.3.0 h1:g0eASXYtp+yvN9fK8sH94oCIk0fau9uV1/ZdJ0AVEzs=
+github.com/stoewer/go-strcase v1.3.0/go.mod h1:fAH5hQ5pehh+j3nZfvwdk2RgEgQjAoM8wodgtPmh1xo=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/tmc/grpc-websocket-proxy v0.0.0-20220101234140-673ab2c3ae75 h1:6fotK7otjonDflCTK0BCfls4SPy3NcCVb5dqqmbRknE=
+github.com/tmc/grpc-websocket-proxy v0.0.0-20220101234140-673ab2c3ae75/go.mod h1:KO6IkyS8Y3j8OdNO85qEYBsRPuteD+YciPomcXdrMnk=
+github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 h1:eY9dn8+vbi4tKz5Qo6v2eYzo7kUS51QINcR5jNpbZS8=
+github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
+github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+go.etcd.io/bbolt v1.3.8 h1:xs88BrvEv273UsB79e0hcVrlUWmS0a8upikMFhSyAtA=
+go.etcd.io/bbolt v1.3.8/go.mod h1:N9Mkw9X8x5fupy0IKsmuqVtoGDyxsaDlbk4Rd05IAQw=
+go.etcd.io/etcd/api/v3 v3.5.11 h1:B54KwXbWDHyD3XYAwprxNzTe7vlhR69LuBgZnMVvS7E=
+go.etcd.io/etcd/api/v3 v3.5.11/go.mod h1:Ot+o0SWSyT6uHhA56al1oCED0JImsRiU9Dc26+C2a+4=
+go.etcd.io/etcd/client/pkg/v3 v3.5.11 h1:bT2xVspdiCj2910T0V+/KHcVKjkUrCZVtk8J2JF2z1A=
+go.etcd.io/etcd/client/pkg/v3 v3.5.11/go.mod h1:seTzl2d9APP8R5Y2hFL3NVlD6qC/dOT+3kvrqPyTas4=
+go.etcd.io/etcd/client/v2 v2.305.10 h1:MrmRktzv/XF8CvtQt+P6wLUlURaNpSDJHFZhe//2QE4=
+go.etcd.io/etcd/client/v2 v2.305.10/go.mod h1:m3CKZi69HzilhVqtPDcjhSGp+kA1OmbNn0qamH80xjA=
+go.etcd.io/etcd/client/v3 v3.5.11 h1:ajWtgoNSZJ1gmS8k+icvPtqsqEav+iUorF7b0qozgUU=
+go.etcd.io/etcd/client/v3 v3.5.11/go.mod h1:a6xQUEqFJ8vztO1agJh/KQKOMfFI8og52ZconzcDJwE=
+go.etcd.io/etcd/pkg/v3 v3.5.10 h1:WPR8K0e9kWl1gAhB5A7gEa5ZBTNkT9NdNWrR8Qpo1CM=
+go.etcd.io/etcd/pkg/v3 v3.5.10/go.mod h1:TKTuCKKcF1zxmfKWDkfz5qqYaE3JncKKZPFf8c1nFUs=
+go.etcd.io/etcd/raft/v3 v3.5.10 h1:cgNAYe7xrsrn/5kXMSaH8kM/Ky8mAdMqGOxyYwpP0LA=
+go.etcd.io/etcd/raft/v3 v3.5.10/go.mod h1:odD6kr8XQXTy9oQnyMPBOr0TVe+gT0neQhElQ6jbGRc=
+go.etcd.io/etcd/server/v3 v3.5.10 h1:4NOGyOwD5sUZ22PiWYKmfxqoeh72z6EhYjNosKGLmZg=
+go.etcd.io/etcd/server/v3 v3.5.10/go.mod h1:gBplPHfs6YI0L+RpGkTQO7buDbHv5HJGG/Bst0/zIPo=
+go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.46.1 h1:SpGay3w+nEwMpfVnbqOLH5gY52/foP8RE8UzTZ1pdSE=
+go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.46.1/go.mod h1:4UoMYEZOC0yN/sPGH76KPkkU7zgiEWYWL9vwmbnTJPE=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.1 h1:aFJWCqJMNjENlcleuuOkGAPH82y0yULBScfXcIEdS24=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.1/go.mod h1:sEGXWArGqc3tVa+ekntsN65DmVbVeW+7lTKTjZF3/Fo=
+go.opentelemetry.io/otel v1.21.0 h1:hzLeKBZEL7Okw2mGzZ0cc4k/A7Fta0uoPgaJCr8fsFc=
+go.opentelemetry.io/otel v1.21.0/go.mod h1:QZzNPQPm1zLX4gZK4cMi+71eaorMSGT3A4znnUvNNEo=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0 h1:cl5P5/GIfFh4t6xyruOgJP5QiA1pw4fYYdv6nc6CBWw=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.21.0/go.mod h1:zgBdWWAu7oEEMC06MMKc5NLbA/1YDXV1sMpSqEeLQLg=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.21.0 h1:tIqheXEFWAZ7O8A7m+J0aPTmpJN3YQ7qetUAdkkkKpk=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.21.0/go.mod h1:nUeKExfxAQVbiVFn32YXpXZZHZ61Cc3s3Rn1pDBGAb0=
+go.opentelemetry.io/otel/metric v1.21.0 h1:tlYWfeo+Bocx5kLEloTjbcDwBuELRrIFxwdQ36PlJu4=
+go.opentelemetry.io/otel/metric v1.21.0/go.mod h1:o1p3CA8nNHW8j5yuQLdc1eeqEaPfzug24uvsyIEJRWM=
+go.opentelemetry.io/otel/sdk v1.21.0 h1:FTt8qirL1EysG6sTQRZ5TokkU8d0ugCj8htOgThZXQ8=
+go.opentelemetry.io/otel/sdk v1.21.0/go.mod h1:Nna6Yv7PWTdgJHVRD9hIYywQBRx7pbox6nwBnZIxl/E=
+go.opentelemetry.io/otel/trace v1.21.0 h1:WD9i5gzvoUPuXIXH24ZNBudiarZDKuekPqi/E8fpfLc=
+go.opentelemetry.io/otel/trace v1.21.0/go.mod h1:LGbsEB0f9LGjN+OZaQQ26sohbOmiMR+BaslueVtS/qQ=
+go.opentelemetry.io/proto/otlp v1.0.0 h1:T0TX0tmXU8a3CbNXzEKGeU5mIVOdf0oykP+u2lIVU/I=
+go.opentelemetry.io/proto/otlp v1.0.0/go.mod h1:Sy6pihPLfYHkr3NkUbEhGHFhINUSI/v80hjKIs5JXpM=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
+go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
+go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
+go.uber.org/zap v1.26.0 h1:sI7k6L95XOKS281NhVKOFCUNIvv9e0w4BF8N3u+tCRo=
+go.uber.org/zap v1.26.0/go.mod h1:dtElttAiwGvoJ/vj4IwHBS/gXsEu/pZ50mUIRWuG0so=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
+golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
+golang.org/x/exp v0.0.0-20231226003508-02704c960a9b h1:kLiC65FbiHWFAOu+lxwNPujcsl8VYyTYYEZnsOO1WK4=
+golang.org/x/exp v0.0.0-20231226003508-02704c960a9b/go.mod h1:iRJReGqOEeBhDZGkGbynYwcHlctCvnjTYIamk7uXpHI=
+golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.17.0 h1:zY54UmvipHiNd+pm+m0x9KhZ9hl1/7QNMyxXbc6ICqA=
+golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
+golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
+golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/oauth2 v0.18.0 h1:09qnuIAgzdx1XplqJvW6CQqMCtGZykZWcXzPMPUusvI=
+golang.org/x/oauth2 v0.18.0/go.mod h1:Wf7knwG0MPoWIMMBgFlEaSUDaKskp0dCfrlJRJXbBi8=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
+golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
+golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.27.0 h1:WP60Sv1nlK1T6SupCHbXzSaN0b9wUmsPoRS9b61A23Q=
+golang.org/x/term v0.27.0/go.mod h1:iMsnZpn0cago0GOrHO2+Y7u7JPn5AylBrcoWkElMTSM=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
+golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
+golang.org/x/time v0.5.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
+golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d h1:vU5i/LfpvrRCpgM/VPfJLg5KjxD3E+hfT1SH+d9zLwg=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/appengine v1.6.8 h1:IhEN5q69dyKagZPYMSdIjS2HqprW324FRQZJcGqPAsM=
+google.golang.org/appengine v1.6.8/go.mod h1:1jJ3jBArFh5pcgW8gCtRJnepW8FzD1V44FJffLiz/Ds=
+google.golang.org/genproto v0.0.0-20231212172506-995d672761c0 h1:YJ5pD9rF8o9Qtta0Cmy9rdBwkSjrTCT6XTiUQVOtIos=
+google.golang.org/genproto v0.0.0-20231212172506-995d672761c0/go.mod h1:l/k7rMz0vFTBPy+tFSGvXEd3z+BcoG1k7EHbqm+YBsY=
+google.golang.org/genproto/googleapis/api v0.0.0-20231212172506-995d672761c0 h1:s1w3X6gQxwrLEpxnLd/qXTVLgQE2yXwaOaoa6IlY/+o=
+google.golang.org/genproto/googleapis/api v0.0.0-20231212172506-995d672761c0/go.mod h1:CAny0tYF+0/9rmDB9fahA9YLzX3+AEVl1qXbv5hhj6c=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20231212172506-995d672761c0 h1:/jFB8jK5R3Sq3i/lmeZO0cATSzFfZaJq1J2Euan3XKU=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20231212172506-995d672761c0/go.mod h1:FUoWkonphQm3RhTS+kOEhF8h0iDpm4tdXolVCeZ9KKA=
+google.golang.org/grpc v1.60.1 h1:26+wFr+cNqSGFcOXcabYC0lUVJVRa2Sb2ortSK7VrEU=
+google.golang.org/grpc v1.60.1/go.mod h1:OlCHIeLYqSSsLi6i49B5QGdzaMZK9+M7LXN2FKz4eGM=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
+gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
+gopkg.in/natefinch/lumberjack.v2 v2.2.1 h1:bBRl1b0OH9s/DuPhuXpNl+VtCaJXFZ5/uEFST95x9zc=
+gopkg.in/natefinch/lumberjack.v2 v2.2.1/go.mod h1:YD8tP3GAjkrDg1eZH7EGmyESg/lsYskCTPBJVb9jqSc=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+k8s.io/api v0.30.0 h1:siWhRq7cNjy2iHssOB9SCGNCl2spiF1dO3dABqZ8niA=
+k8s.io/api v0.30.0/go.mod h1:OPlaYhoHs8EQ1ql0R/TsUgaRPhpKNxIMrKQfWUp8QSE=
+k8s.io/apiextensions-apiserver v0.29.3 h1:9HF+EtZaVpFjStakF4yVufnXGPRppWFEQ87qnO91YeI=
+k8s.io/apiextensions-apiserver v0.29.3/go.mod h1:po0XiY5scnpJfFizNGo6puNU6Fq6D70UJY2Cb2KwAVc=
+k8s.io/apimachinery v0.30.0 h1:qxVPsyDM5XS96NIh9Oj6LavoVFYff/Pon9cZeDIkHHA=
+k8s.io/apimachinery v0.30.0/go.mod h1:iexa2somDaxdnj7bha06bhb43Zpa6eWH8N8dbqVjTUc=
+k8s.io/apiserver v0.30.0 h1:QCec+U72tMQ+9tR6A0sMBB5Vh6ImCEkoKkTDRABWq6M=
+k8s.io/apiserver v0.30.0/go.mod h1:smOIBq8t0MbKZi7O7SyIpjPsiKJ8qa+llcFCluKyqiY=
+k8s.io/client-go v0.30.0 h1:sB1AGGlhY/o7KCyCEQ0bPWzYDL0pwOZO4vAtTSh/gJQ=
+k8s.io/client-go v0.30.0/go.mod h1:g7li5O5256qe6TYdAMyX/otJqMhIiGgTapdLchhmOaY=
+k8s.io/component-base v0.30.0 h1:cj6bp38g0ainlfYtaOQuRELh5KSYjhKxM+io7AUIk4o=
+k8s.io/component-base v0.30.0/go.mod h1:V9x/0ePFNaKeKYA3bOvIbrNoluTSG+fSJKjLdjOoeXQ=
+k8s.io/gengo/v2 v2.0.0-20240228010128-51d4e06bde70 h1:NGrVE502P0s0/1hudf8zjgwki1X/TByhmAoILTarmzo=
+k8s.io/gengo/v2 v2.0.0-20240228010128-51d4e06bde70/go.mod h1:VH3AT8AaQOqiGjMF9p0/IM1Dj+82ZwjfxUP1IxaHE+8=
+k8s.io/klog/v2 v2.120.1 h1:QXU6cPEOIslTGvZaXvFWiP9VKyeet3sawzTOvdXb4Vw=
+k8s.io/klog/v2 v2.120.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
+k8s.io/kms v0.30.0 h1:ZlnD/ei5lpvUlPw6eLfVvH7d8i9qZ6HwUQgydNVks8g=
+k8s.io/kms v0.30.0/go.mod h1:GrMurD0qk3G4yNgGcsCEmepqf9KyyIrTXYR2lyUOJC4=
+k8s.io/kube-openapi v0.0.0-20240430033511-f0e62f92d13f h1:0LQagt0gDpKqvIkAMPaRGcXawNMouPECM1+F9BVxEaM=
+k8s.io/kube-openapi v0.0.0-20240430033511-f0e62f92d13f/go.mod h1:S9tOR0FxgyusSNR+MboCuiDpVWkAifZvaYI1Q2ubgro=
+k8s.io/metrics v0.30.0 h1:tqB+T0GJY288KahaO3Eb41HaDVeLR18gBmyPo0R417s=
+k8s.io/metrics v0.30.0/go.mod h1:nSDA8V19WHhCTBhRYuyzJT9yPJBxSpqbyrGCCQ4jPj4=
+k8s.io/utils v0.0.0-20240423183400-0849a56e8f22 h1:ao5hUqGhsqdm+bYbjH/pRkCs0unBGe9UyDahzs9zQzQ=
+k8s.io/utils v0.0.0-20240423183400-0849a56e8f22/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.29.0 h1:/U5vjBbQn3RChhv7P11uhYvCSm5G2GaIi5AIGBS6r4c=
+sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.29.0/go.mod h1:z7+wmGM2dfIiLRfrC6jb5kV2Mq/sK1ZP303cxzkV5Y4=
+sigs.k8s.io/controller-runtime v0.17.2 h1:FwHwD1CTUemg0pW2otk7/U5/i5m2ymzvOXdbeGOUvw0=
+sigs.k8s.io/controller-runtime v0.17.2/go.mod h1:+MngTvIQQQhfXtwfdGw/UOQ/aIaqsYywfCINOtwMO/s=
+sigs.k8s.io/custom-metrics-apiserver v1.30.0 h1:BCgg2QfInoWXvoJgPK8TxrSS9r5wR4NNvr7M+9sUOYo=
+sigs.k8s.io/custom-metrics-apiserver v1.30.0/go.mod h1:QXOKIL83M545uITzoZn4OC1C7nr0WhLh70A38pbzUpk=
+sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=
+sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
+sigs.k8s.io/metrics-server v0.7.1 h1:LhdCzkaI7VI7/N7pR4hDauTuWyc9Pxr+ihjTDuS9GIo=
+sigs.k8s.io/metrics-server v0.7.1/go.mod h1:vt+pIEbw5tpmyRR46WJb3pRm1JEzf/HxRN+VClTKuqI=
+sigs.k8s.io/structured-merge-diff/v4 v4.4.1 h1:150L+0vs/8DA78h1u02ooW1/fFq/Lwr+sGiqlzvrtq4=
+sigs.k8s.io/structured-merge-diff/v4 v4.4.1/go.mod h1:N8hJocpFajUSSeSJ9bOZ77VzejKZaXsTtZo4/u7Io08=
+sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E=
+sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY=

hack/boilerplate.go.txt

@@ -0,0 +1,15 @@
+/*
+Copyright The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/

hack/gofmt-all.sh

@@ -1,41 +0,0 @@
-#!/bin/bash
-
-# Copyright 2017 The Kubernetes Authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-verify=0
-if [[ ${1:-} = "--verify" || ${1:-} = "-v" ]]; then
-  verify=1
-fi
-
-find_files() {
-  find . -not \( \( \
-    -wholename './_output' \
-    -o -wholename './vendor' \
-  \) -prune \) -name '*.go'
-}
-
-if [[ $verify -eq 1 ]]; then
-  diff=$(find_files | xargs gofmt -s -d 2>&1)
-  if [[ -n "${diff}" ]]; then
-    echo "gofmt -s -w $(echo "${diff}" | awk '/^diff / { print $2 }' | tr '\n' ' ')"
-    exit 1
-  fi
-else
-  find_files | xargs gofmt -s -w
-fi

hack/tools.go

@@ -0,0 +1,24 @@
+// Copyright 2021 The Kubernetes Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build tools
+// +build tools
+
+// Package tools tracks dependencies for tools that used in the build process.
+// See https://github.com/golang/go/wiki/Modules
+package tools
+
+import (
+	_ "k8s.io/kube-openapi/cmd/openapi-gen"
+)

pkg/api/openapi-gen.go

@@ -0,0 +1,26 @@
+//go:build codegen
+// +build codegen
+
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package is only a stub to ensure k8s.io/kube-openapi/cmd/openapi-gen is vendored
+// so the same version of kube-openapi is used to generate and render the openapi spec
+package main
+
+import (
+	_ "k8s.io/kube-openapi/cmd/openapi-gen"
+)

pkg/client/api.go

@@ -21,14 +21,14 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"path"
+	"strings"
 	"time"
 
-	"github.com/golang/glog"
 	"github.com/prometheus/common/model"
+	"k8s.io/klog/v2"
 )
 
 // APIClient is a raw client to the Prometheus Query API.
@@ -47,17 +47,31 @@ type GenericAPIClient interface {
 type httpAPIClient struct {
 	client  *http.Client
 	baseURL *url.URL
+	headers http.Header
 }
 
 func (c *httpAPIClient) Do(ctx context.Context, verb, endpoint string, query url.Values) (APIResponse, error) {
 	u := *c.baseURL
 	u.Path = path.Join(c.baseURL.Path, endpoint)
-	u.RawQuery = query.Encode()
-	req, err := http.NewRequest(verb, u.String(), nil)
+	var reqBody io.Reader
+	if verb == http.MethodGet {
+		u.RawQuery = query.Encode()
+	} else if verb == http.MethodPost {
+		reqBody = strings.NewReader(query.Encode())
+	}
+
+	req, err := http.NewRequestWithContext(ctx, verb, u.String(), reqBody)
 	if err != nil {
 		return APIResponse{}, fmt.Errorf("error constructing HTTP request to Prometheus: %v", err)
 	}
-	req.WithContext(ctx)
+	for key, values := range c.headers {
+		for _, value := range values {
+			req.Header.Add(key, value)
+		}
+	}
+	if verb == http.MethodPost {
+		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	}
 
 	resp, err := c.client.Do(req)
 	defer func() {
@@ -70,8 +84,8 @@ func (c *httpAPIClient) Do(ctx context.Context, verb, endpoint string, query url
 		return APIResponse{}, err
 	}
 
-	if glog.V(6) {
-		glog.Infof("%s %s %s", verb, u.String(), resp.Status)
+	if klog.V(6).Enabled() {
+		klog.Infof("%s %s %s", verb, u.String(), resp.Status)
 	}
 
 	code := resp.StatusCode
@@ -85,12 +99,12 @@ func (c *httpAPIClient) Do(ctx context.Context, verb, endpoint string, query url
 	}
 
 	var body io.Reader = resp.Body
-	if glog.V(8) {
-		data, err := ioutil.ReadAll(body)
+	if klog.V(8).Enabled() {
+		data, err := io.ReadAll(body)
 		if err != nil {
 			return APIResponse{}, fmt.Errorf("unable to log response body: %v", err)
 		}
-		glog.Infof("Response Body: %s", string(data))
+		klog.Infof("Response Body: %s", string(data))
 		body = bytes.NewReader(data)
 	}
 
@@ -113,10 +127,11 @@ func (c *httpAPIClient) Do(ctx context.Context, verb, endpoint string, query url
 }
 
 // NewGenericAPIClient builds a new generic Prometheus API client for the given base URL and HTTP Client.
-func NewGenericAPIClient(client *http.Client, baseURL *url.URL) GenericAPIClient {
+func NewGenericAPIClient(client *http.Client, baseURL *url.URL, headers http.Header) GenericAPIClient {
 	return &httpAPIClient{
 		client:  client,
 		baseURL: baseURL,
+		headers: headers,
 	}
 }
 
@@ -128,20 +143,22 @@ const (
 
 // queryClient is a Client that connects to the Prometheus HTTP API.
 type queryClient struct {
-	api GenericAPIClient
+	api  GenericAPIClient
+	verb string
 }
 
 // NewClientForAPI creates a Client for the given generic Prometheus API client.
-func NewClientForAPI(client GenericAPIClient) Client {
+func NewClientForAPI(client GenericAPIClient, verb string) Client {
 	return &queryClient{
-		api: client,
+		api:  client,
+		verb: verb,
 	}
 }
 
 // NewClient creates a Client for the given HTTP client and base URL (the location of the Prometheus server).
-func NewClient(client *http.Client, baseURL *url.URL) Client {
-	genericClient := NewGenericAPIClient(client, baseURL)
-	return NewClientForAPI(genericClient)
+func NewClient(client *http.Client, baseURL *url.URL, headers http.Header, verb string) Client {
+	genericClient := NewGenericAPIClient(client, baseURL, headers)
+	return NewClientForAPI(genericClient, verb)
 }
 
 func (h *queryClient) Series(ctx context.Context, interval model.Interval, selectors ...Selector) ([]Series, error) {
@@ -157,7 +174,7 @@ func (h *queryClient) Series(ctx context.Context, interval model.Interval, selec
 		vals.Add("match[]", string(selector))
 	}
 
-	res, err := h.api.Do(ctx, "GET", seriesURL, vals)
+	res, err := h.api.Do(ctx, h.verb, seriesURL, vals)
 	if err != nil {
 		return nil, err
 	}
@@ -177,7 +194,7 @@ func (h *queryClient) Query(ctx context.Context, t model.Time, query Selector) (
 		vals.Set("timeout", model.Duration(timeout).String())
 	}
 
-	res, err := h.api.Do(ctx, "GET", queryURL, vals)
+	res, err := h.api.Do(ctx, h.verb, queryURL, vals)
 	if err != nil {
 		return QueryResult{}, err
 	}
@@ -204,7 +221,7 @@ func (h *queryClient) QueryRange(ctx context.Context, r Range, query Selector) (
 		vals.Set("timeout", model.Duration(timeout).String())
 	}
 
-	res, err := h.api.Do(ctx, "GET", queryRangeURL, vals)
+	res, err := h.api.Do(ctx, h.verb, queryRangeURL, vals)
 	if err != nil {
 		return QueryResult{}, err
 	}
@@ -218,7 +235,7 @@ func (h *queryClient) QueryRange(ctx context.Context, r Range, query Selector) (
 // when present
 func timeoutFromContext(ctx context.Context) (time.Duration, bool) {
 	if deadline, hasDeadline := ctx.Deadline(); hasDeadline {
-		return time.Now().Sub(deadline), true
+		return time.Since(deadline), true
 	}
 
 	return time.Duration(0), false

pkg/client/fake/client.go

@@ -0,0 +1,78 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package fake
+
+import (
+	"context"
+	"fmt"
+
+	pmodel "github.com/prometheus/common/model"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+)
+
+// FakePrometheusClient is a fake instance of prom.Client
+type FakePrometheusClient struct {
+	// AcceptableInterval is the interval in which to return queries
+	AcceptableInterval pmodel.Interval
+	// ErrQueries are queries that result in an error (whether from Query or Series)
+	ErrQueries map[prom.Selector]error
+	// Series are non-error responses to partial Series calls
+	SeriesResults map[prom.Selector][]prom.Series
+	// QueryResults are non-error responses to Query
+	QueryResults map[prom.Selector]prom.QueryResult
+}
+
+func (c *FakePrometheusClient) Series(_ context.Context, interval pmodel.Interval, selectors ...prom.Selector) ([]prom.Series, error) {
+	if (interval.Start != 0 && interval.Start < c.AcceptableInterval.Start) || (interval.End != 0 && interval.End > c.AcceptableInterval.End) {
+		return nil, fmt.Errorf("interval [%v, %v] for query is outside range [%v, %v]", interval.Start, interval.End, c.AcceptableInterval.Start, c.AcceptableInterval.End)
+	}
+	res := []prom.Series{}
+	for _, sel := range selectors {
+		if err, found := c.ErrQueries[sel]; found {
+			return nil, err
+		}
+		if series, found := c.SeriesResults[sel]; found {
+			res = append(res, series...)
+		}
+	}
+
+	return res, nil
+}
+
+func (c *FakePrometheusClient) Query(_ context.Context, t pmodel.Time, query prom.Selector) (prom.QueryResult, error) {
+	if t < c.AcceptableInterval.Start || t > c.AcceptableInterval.End {
+		return prom.QueryResult{}, fmt.Errorf("time %v for query is outside range [%v, %v]", t, c.AcceptableInterval.Start, c.AcceptableInterval.End)
+	}
+
+	if err, found := c.ErrQueries[query]; found {
+		return prom.QueryResult{}, err
+	}
+
+	if res, found := c.QueryResults[query]; found {
+		return res, nil
+	}
+
+	return prom.QueryResult{
+		Type:   pmodel.ValVector,
+		Vector: &pmodel.Vector{},
+	}, nil
+}
+
+func (c *FakePrometheusClient) QueryRange(_ context.Context, r prom.Range, query prom.Selector) (prom.QueryResult, error) {
+	return prom.QueryResult{}, nil
+}

pkg/client/helpers.go

@@ -13,6 +13,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
+
 package client
 
 import (
@@ -22,14 +23,14 @@ import (
 
 // LabelNeq produces a not-equal label selector expression.
 // Label is passed verbatim, and value is double-quote escaped
-// using Go's escaping is used on value (as per the PromQL rules).
+// using Go's escaping (as per the PromQL rules).
 func LabelNeq(label string, value string) string {
 	return fmt.Sprintf("%s!=%q", label, value)
 }
 
 // LabelEq produces a equal label selector expression.
 // Label is passed verbatim, and value is double-quote escaped
-// using Go's escaping is used on value (as per the PromQL rules).
+// using Go's escaping (as per the PromQL rules).
 func LabelEq(label string, value string) string {
 	return fmt.Sprintf("%s=%q", label, value)
 }
@@ -52,7 +53,7 @@ func NameMatches(expr string) string {
 }
 
 // NameNotMatches produces a label selector expression that checks that the series name doesn't matches the given expression.
-// It's a convinience wrapper around LabelNotMatches.
+// It's a convenience wrapper around LabelNotMatches.
 func NameNotMatches(expr string) string {
 	return LabelNotMatches("__name__", expr)
 }

pkg/client/interfaces.go

@@ -13,12 +13,14 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
+
 package client
 
 import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/prometheus/common/model"
@@ -26,7 +28,7 @@ import (
 
 // NB: the official prometheus API client at https://github.com/prometheus/client_golang
 // is rather lackluster -- as of the time of writing of this file, it lacked support
-// for querying the series metadata, which we need for the adapter.  Instead, we use
+// for querying the series metadata, which we need for the adapter. Instead, we use
 // this client.
 
 // Selector represents a series selector
@@ -121,3 +123,11 @@ func (s *Series) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+func (s *Series) String() string {
+	lblStrings := make([]string, 0, len(s.Labels))
+	for k, v := range s.Labels {
+		lblStrings = append(lblStrings, fmt.Sprintf("%s=%q", k, v))
+	}
+	return fmt.Sprintf("%s{%s}", s.Name, strings.Join(lblStrings, ","))
+}

pkg/client/metrics/metrics.go

@@ -13,34 +13,51 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
+
 package metrics
 
 import (
 	"context"
+	"net/http"
 	"net/url"
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
 
-	"github.com/directxman12/k8s-prometheus-adapter/pkg/client"
+	apimetrics "k8s.io/apiserver/pkg/endpoints/metrics"
+	"k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+
+	"sigs.k8s.io/prometheus-adapter/pkg/client"
 )
 
 var (
 	// queryLatency is the total latency of any query going through the
 	// various endpoints (query, range-query, series).  It includes some deserialization
 	// overhead and HTTP overhead.
-	queryLatency = prometheus.NewHistogramVec(
-		prometheus.HistogramOpts{
-			Name:    "cmgateway_prometheus_query_latency_seconds",
-			Help:    "Prometheus client query latency in seconds.  Broken down by target prometheus endpoint and target server",
-			Buckets: prometheus.ExponentialBuckets(0.0001, 2, 10),
+	queryLatency = metrics.NewHistogramVec(
+		&metrics.HistogramOpts{
+			Namespace: "prometheus_adapter",
+			Subsystem: "prometheus_client",
+			Name:      "request_duration_seconds",
+			Help:      "Prometheus client query latency in seconds.  Broken down by target prometheus endpoint and target server",
+			Buckets:   prometheus.DefBuckets,
 		},
-		[]string{"endpoint", "server"},
+		[]string{"path", "server"},
 	)
 )
 
-func init() {
-	prometheus.MustRegister(queryLatency)
+func MetricsHandler() (http.HandlerFunc, error) {
+	registry := metrics.NewKubeRegistry()
+	err := registry.Register(queryLatency)
+	if err != nil {
+		return nil, err
+	}
+	apimetrics.Register()
+	return func(w http.ResponseWriter, req *http.Request) {
+		legacyregistry.Handler().ServeHTTP(w, req)
+		metrics.HandlerFor(registry, metrics.HandlerOpts{}).ServeHTTP(w, req)
+	}, nil
 }
 
 // instrumentedClient is a client.GenericAPIClient which instruments calls to Do,
@@ -62,7 +79,7 @@ func (c *instrumentedGenericClient) Do(ctx context.Context, verb, endpoint strin
 				return
 			}
 		}
-		queryLatency.With(prometheus.Labels{"endpoint": endpoint, "server": c.serverName}).Observe(endTime.Sub(startTime).Seconds())
+		queryLatency.With(prometheus.Labels{"path": endpoint, "server": c.serverName}).Observe(endTime.Sub(startTime).Seconds())
 	}()
 
 	var resp client.APIResponse

pkg/client/types.go

@@ -25,10 +25,10 @@ type ErrorType string
 
 const (
 	ErrBadData     ErrorType = "bad_data"
-	ErrTimeout               = "timeout"
-	ErrCanceled              = "canceled"
-	ErrExec                  = "execution"
-	ErrBadResponse           = "bad_response"
+	ErrTimeout     ErrorType = "timeout"
+	ErrCanceled    ErrorType = "canceled"
+	ErrExec        ErrorType = "execution"
+	ErrBadResponse ErrorType = "bad_response"
 )
 
 // Error is an error returned by the API.
@@ -46,7 +46,7 @@ type ResponseStatus string
 
 const (
 	ResponseSucceeded ResponseStatus = "succeeded"
-	ResponseError                    = "error"
+	ResponseError     ResponseStatus = "error"
 )
 
 // APIResponse represents the raw response returned by the API.

pkg/config/config.go

@@ -0,0 +1,111 @@
+package config
+
+import (
+	pmodel "github.com/prometheus/common/model"
+)
+
+type MetricsDiscoveryConfig struct {
+	// Rules specifies how to discover and map Prometheus metrics to
+	// custom metrics API resources.  The rules are applied independently,
+	// and thus must be mutually exclusive.  Rules with the same SeriesQuery
+	// will make only a single API call.
+	Rules         []DiscoveryRule `json:"rules" yaml:"rules"`
+	ResourceRules *ResourceRules  `json:"resourceRules,omitempty" yaml:"resourceRules,omitempty"`
+	ExternalRules []DiscoveryRule `json:"externalRules,omitempty" yaml:"externalRules,omitempty"`
+}
+
+// DiscoveryRule describes a set of rules for transforming Prometheus metrics to/from
+// custom metrics API resources.
+type DiscoveryRule struct {
+	// SeriesQuery specifies which metrics this rule should consider via a Prometheus query
+	// series selector query.
+	SeriesQuery string `json:"seriesQuery" yaml:"seriesQuery"`
+	// SeriesFilters specifies additional regular expressions to be applied on
+	// the series names returned from the query.  This is useful for constraints
+	// that can't be represented in the SeriesQuery (e.g. series matching `container_.+`
+	// not matching `container_.+_total`.  A filter will be automatically appended to
+	// match the form specified in Name.
+	SeriesFilters []RegexFilter `json:"seriesFilters" yaml:"seriesFilters"`
+	// Resources specifies how associated Kubernetes resources should be discovered for
+	// the given metrics.
+	Resources ResourceMapping `json:"resources" yaml:"resources"`
+	// Name specifies how the metric name should be transformed between custom metric
+	// API resources, and Prometheus metric names.
+	Name NameMapping `json:"name" yaml:"name"`
+	// MetricsQuery specifies modifications to the metrics query, such as converting
+	// cumulative metrics to rate metrics.  It is a template where `.LabelMatchers` is
+	// a the comma-separated base label matchers and `.Series` is the series name, and
+	// `.GroupBy` is the comma-separated expected group-by label names. The delimeters
+	// are `<<` and `>>`.
+	MetricsQuery string `json:"metricsQuery,omitempty" yaml:"metricsQuery,omitempty"`
+}
+
+// RegexFilter is a filter that matches positively or negatively against a regex.
+// Only one field may be set at a time.
+type RegexFilter struct {
+	Is    string `json:"is,omitempty" yaml:"is,omitempty"`
+	IsNot string `json:"isNot,omitempty" yaml:"isNot,omitempty"`
+}
+
+// ResourceMapping specifies how to map Kubernetes resources to Prometheus labels
+type ResourceMapping struct {
+	// Template specifies a golang string template for converting a Kubernetes
+	// group-resource to a Prometheus label.  The template object contains
+	// the `.Group` and `.Resource` fields.  The `.Group` field will have
+	// dots replaced with underscores, and the `.Resource` field will be
+	// singularized.  The delimiters are `<<` and `>>`.
+	Template string `json:"template,omitempty" yaml:"template,omitempty"`
+	// Overrides specifies exceptions to the above template, mapping label names
+	// to group-resources
+	Overrides map[string]GroupResource `json:"overrides,omitempty" yaml:"overrides,omitempty"`
+	// Namespaced ignores the source namespace of the requester and requires one in the query
+	Namespaced *bool `json:"namespaced,omitempty" yaml:"namespaced,omitempty"`
+}
+
+// GroupResource represents a Kubernetes group-resource.
+type GroupResource struct {
+	Group    string `json:"group,omitempty" yaml:"group,omitempty"`
+	Resource string `json:"resource" yaml:"resource"`
+}
+
+// NameMapping specifies how to convert Prometheus metrics
+// to/from custom metrics API resources.
+type NameMapping struct {
+	// Matches is a regular expression that is used to match
+	// Prometheus series names.  It may be left blank, in which
+	// case it is equivalent to `.*`.
+	Matches string `json:"matches" yaml:"matches"`
+	// As is the name used in the API.  Captures from Matches
+	// are available for use here.  If not specified, it defaults
+	// to $0 if no capture groups are present in Matches, or $1
+	// if only one is present, and will error if multiple are.
+	As string `json:"as" yaml:"as"`
+}
+
+// ResourceRules describe the rules for querying resource metrics
+// API results.  It's assumed that the same metrics can be used
+// to aggregate across different resources.
+type ResourceRules struct {
+	CPU    ResourceRule `json:"cpu" yaml:"cpu"`
+	Memory ResourceRule `json:"memory" yaml:"memory"`
+	// Window is the window size reported by the resource metrics API.  It should match the value used
+	// in your containerQuery and nodeQuery if you use a `rate` function.
+	Window pmodel.Duration `json:"window" yaml:"window"`
+}
+
+// ResourceRule describes how to query metrics for some particular
+// system resource metric.
+type ResourceRule struct {
+	// Container is the query used to fetch the metrics for containers.
+	ContainerQuery string `json:"containerQuery" yaml:"containerQuery"`
+	// NodeQuery is the query used to fetch the metrics for nodes
+	// (for instance, simply aggregating by node label is insufficient for
+	// cadvisor metrics -- you need to select the `/` container).
+	NodeQuery string `json:"nodeQuery" yaml:"nodeQuery"`
+	// Resources specifies how associated Kubernetes resources should be discovered for
+	// the given metrics.
+	Resources ResourceMapping `json:"resources" yaml:"resources"`
+	// ContainerLabel indicates the name of the Prometheus label containing the container name
+	// (since "container" is not a resource, this can't go in the `resources` block, but is similar).
+	ContainerLabel string `json:"containerLabel" yaml:"containerLabel"`
+}

pkg/config/loader.go

@@ -0,0 +1,32 @@
+package config
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	yaml "gopkg.in/yaml.v2"
+)
+
+// FromFile loads the configuration from a particular file.
+func FromFile(filename string) (*MetricsDiscoveryConfig, error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, fmt.Errorf("unable to load metrics discovery config file: %v", err)
+	}
+	defer file.Close()
+	contents, err := io.ReadAll(file)
+	if err != nil {
+		return nil, fmt.Errorf("unable to load metrics discovery config file: %v", err)
+	}
+	return FromYAML(contents)
+}
+
+// FromYAML loads the configuration from a blob of YAML.
+func FromYAML(contents []byte) (*MetricsDiscoveryConfig, error) {
+	var cfg MetricsDiscoveryConfig
+	if err := yaml.UnmarshalStrict(contents, &cfg); err != nil {
+		return nil, fmt.Errorf("unable to parse metrics discovery config: %v", err)
+	}
+	return &cfg, nil
+}

pkg/custom-provider/metric_namer.go

@@ -1,343 +0,0 @@
-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package provider
-
-import (
-	"fmt"
-	"strings"
-	"sync"
-
-	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
-	apimeta "k8s.io/apimachinery/pkg/api/meta"
-	"k8s.io/apimachinery/pkg/runtime/schema"
-
-	prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
-	"github.com/golang/glog"
-	pmodel "github.com/prometheus/common/model"
-)
-
-// NB: container metrics sourced from cAdvisor don't consistently follow naming conventions,
-// so we need to whitelist them and handle them on a case-by-case basis.  Metrics ending in `_total`
-// *should* be counters, but may actually be guages in this case.
-
-// SeriesType represents the kind of series backing a metric.
-type SeriesType int
-
-const (
-	CounterSeries SeriesType = iota
-	SecondsCounterSeries
-	GaugeSeries
-)
-
-// SeriesRegistry provides conversions between Prometheus series and MetricInfo
-type SeriesRegistry interface {
-	// SetSeries replaces the known series in this registry
-	SetSeries(series []prom.Series) error
-	// ListAllMetrics lists all metrics known to this registry
-	ListAllMetrics() []provider.MetricInfo
-	// SeriesForMetric looks up the minimum required series information to make a query for the given metric
-	// against the given resource (namespace may be empty for non-namespaced resources)
-	QueryForMetric(info provider.MetricInfo, namespace string, resourceNames ...string) (kind SeriesType, query prom.Selector, groupBy string, found bool)
-	// MatchValuesToNames matches result values to resource names for the given metric and value set
-	MatchValuesToNames(metricInfo provider.MetricInfo, values pmodel.Vector) (matchedValues map[string]pmodel.SampleValue, found bool)
-}
-
-type seriesInfo struct {
-	// baseSeries represents the minimum information to access a particular series
-	baseSeries prom.Series
-	// kind is the type of this series
-	kind SeriesType
-	// isContainer indicates if the series is a cAdvisor container_ metric, and thus needs special handling
-	isContainer bool
-}
-
-// overridableSeriesRegistry is a basic SeriesRegistry
-type basicSeriesRegistry struct {
-	mu sync.RWMutex
-
-	// info maps metric info to information about the corresponding series
-	info map[provider.MetricInfo]seriesInfo
-	// metrics is the list of all known metrics
-	metrics []provider.MetricInfo
-
-	// namer is the metricNamer responsible for converting series to metric names and information
-	namer metricNamer
-}
-
-func (r *basicSeriesRegistry) SetSeries(newSeries []prom.Series) error {
-	newInfo := make(map[provider.MetricInfo]seriesInfo)
-	for _, series := range newSeries {
-		if strings.HasPrefix(series.Name, "container_") {
-			r.namer.processContainerSeries(series, newInfo)
-		} else if namespaceLabel, hasNamespaceLabel := series.Labels["namespace"]; hasNamespaceLabel && namespaceLabel != "" {
-			// we also handle namespaced metrics here as part of the resource-association logic
-			if err := r.namer.processNamespacedSeries(series, newInfo); err != nil {
-				glog.Errorf("Unable to process namespaced series %q: %v", series.Name, err)
-				continue
-			}
-		} else {
-			if err := r.namer.processRootScopedSeries(series, newInfo); err != nil {
-				glog.Errorf("Unable to process root-scoped series %q: %v", series.Name, err)
-				continue
-			}
-		}
-	}
-
-	newMetrics := make([]provider.MetricInfo, 0, len(newInfo))
-	for info := range newInfo {
-		newMetrics = append(newMetrics, info)
-	}
-
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
-	r.info = newInfo
-	r.metrics = newMetrics
-
-	return nil
-}
-
-func (r *basicSeriesRegistry) ListAllMetrics() []provider.MetricInfo {
-	r.mu.RLock()
-	defer r.mu.RUnlock()
-
-	return r.metrics
-}
-
-func (r *basicSeriesRegistry) QueryForMetric(metricInfo provider.MetricInfo, namespace string, resourceNames ...string) (kind SeriesType, query prom.Selector, groupBy string, found bool) {
-	r.mu.RLock()
-	defer r.mu.RUnlock()
-
-	if len(resourceNames) == 0 {
-		glog.Errorf("no resource names requested while producing a query for metric %s", metricInfo.String())
-		return 0, "", "", false
-	}
-
-	metricInfo, singularResource, err := metricInfo.Normalized(r.namer.mapper)
-	if err != nil {
-		glog.Errorf("unable to normalize group resource while producing a query: %v", err)
-		return 0, "", "", false
-	}
-
-	// TODO: support container metrics
-	if info, found := r.info[metricInfo]; found {
-		targetValue := resourceNames[0]
-		matcher := prom.LabelEq
-		if len(resourceNames) > 1 {
-			targetValue = strings.Join(resourceNames, "|")
-			matcher = prom.LabelMatches
-		}
-
-		var expressions []string
-		if info.isContainer {
-			expressions = []string{matcher("pod_name", targetValue), prom.LabelNeq("container_name", "POD")}
-			groupBy = "pod_name"
-		} else {
-			// TODO: copy base series labels?
-			expressions = []string{matcher(singularResource, targetValue)}
-			groupBy = singularResource
-		}
-
-		if metricInfo.Namespaced {
-			expressions = append(expressions, prom.LabelEq("namespace", namespace))
-		}
-
-		return info.kind, prom.MatchSeries(info.baseSeries.Name, expressions...), groupBy, true
-	}
-
-	glog.V(10).Infof("metric %v not registered", metricInfo)
-	return 0, "", "", false
-}
-
-func (r *basicSeriesRegistry) MatchValuesToNames(metricInfo provider.MetricInfo, values pmodel.Vector) (matchedValues map[string]pmodel.SampleValue, found bool) {
-	r.mu.RLock()
-	defer r.mu.RUnlock()
-
-	metricInfo, singularResource, err := metricInfo.Normalized(r.namer.mapper)
-	if err != nil {
-		glog.Errorf("unable to normalize group resource while matching values to names: %v", err)
-		return nil, false
-	}
-
-	if info, found := r.info[metricInfo]; found {
-		res := make(map[string]pmodel.SampleValue, len(values))
-		for _, val := range values {
-			if val == nil {
-				// skip empty values
-				continue
-			}
-
-			labelName := pmodel.LabelName(singularResource)
-			if info.isContainer {
-				labelName = pmodel.LabelName("pod_name")
-			}
-			res[string(val.Metric[labelName])] = val.Value
-		}
-
-		return res, true
-	}
-
-	return nil, false
-}
-
-// metricNamer knows how to construct MetricInfo out of raw prometheus series descriptions.
-type metricNamer struct {
-	// overrides contains the list of container metrics whose naming we want to override.
-	// This is used to properly convert certain cAdvisor container metrics.
-	overrides map[string]seriesSpec
-
-	mapper apimeta.RESTMapper
-}
-
-// seriesSpec specifies how to produce metric info for a particular prometheus series source
-type seriesSpec struct {
-	// metricName is the desired output API metric name
-	metricName string
-	// kind indicates whether or not this metric is cumulative,
-	// and thus has to be calculated as a rate when returning it
-	kind SeriesType
-}
-
-// processContainerSeries performs special work to extract metric definitions
-// from cAdvisor-sourced container metrics, which don't particularly follow any useful conventions consistently.
-func (n *metricNamer) processContainerSeries(series prom.Series, infos map[provider.MetricInfo]seriesInfo) {
-
-	originalName := series.Name
-
-	var name string
-	metricKind := GaugeSeries
-	if override, hasOverride := n.overrides[series.Name]; hasOverride {
-		name = override.metricName
-		metricKind = override.kind
-	} else {
-		// chop of the "container_" prefix
-		series.Name = series.Name[10:]
-		name, metricKind = n.metricNameFromSeries(series)
-	}
-
-	info := provider.MetricInfo{
-		GroupResource: schema.GroupResource{Resource: "pods"},
-		Namespaced:    true,
-		Metric:        name,
-	}
-
-	infos[info] = seriesInfo{
-		kind:        metricKind,
-		baseSeries:  prom.Series{Name: originalName},
-		isContainer: true,
-	}
-}
-
-// processNamespacedSeries adds the metric info for the given generic namespaced series to
-// the map of metric info.
-func (n *metricNamer) processNamespacedSeries(series prom.Series, infos map[provider.MetricInfo]seriesInfo) error {
-	// NB: all errors must occur *before* we save the series info
-	name, metricKind := n.metricNameFromSeries(series)
-	resources, err := n.groupResourcesFromSeries(series)
-	if err != nil {
-		return fmt.Errorf("unable to process prometheus series %s: %v", series.Name, err)
-	}
-
-	// we add one metric for each resource that this could describe
-	for _, resource := range resources {
-		info := provider.MetricInfo{
-			GroupResource: resource,
-			Namespaced:    true,
-			Metric:        name,
-		}
-
-		// metrics describing namespaces aren't considered to be namespaced
-		if resource == (schema.GroupResource{Resource: "namespaces"}) {
-			info.Namespaced = false
-		}
-
-		infos[info] = seriesInfo{
-			kind:       metricKind,
-			baseSeries: prom.Series{Name: series.Name},
-		}
-	}
-
-	return nil
-}
-
-// processesRootScopedSeries adds the metric info for the given generic namespaced series to
-// the map of metric info.
-func (n *metricNamer) processRootScopedSeries(series prom.Series, infos map[provider.MetricInfo]seriesInfo) error {
-	// NB: all errors must occur *before* we save the series info
-	name, metricKind := n.metricNameFromSeries(series)
-	resources, err := n.groupResourcesFromSeries(series)
-	if err != nil {
-		return fmt.Errorf("unable to process prometheus series %s: %v", series.Name, err)
-	}
-
-	// we add one metric for each resource that this could describe
-	for _, resource := range resources {
-		info := provider.MetricInfo{
-			GroupResource: resource,
-			Namespaced:    false,
-			Metric:        name,
-		}
-
-		infos[info] = seriesInfo{
-			kind:       metricKind,
-			baseSeries: prom.Series{Name: series.Name},
-		}
-	}
-
-	return nil
-}
-
-// groupResourceFromSeries collects the possible group-resources that this series could describe by
-// going through each label, checking to see if it corresponds to a known resource.  For instance,
-// a series `ingress_http_hits_total{pod="foo",service="bar",ingress="baz",namespace="ns"}`
-// would return three GroupResources: "pods", "services", and "ingresses".
-// Returned MetricInfo is equilavent to the "normalized" info produced by metricInfo.Normalized.
-func (n *metricNamer) groupResourcesFromSeries(series prom.Series) ([]schema.GroupResource, error) {
-	var res []schema.GroupResource
-	for label := range series.Labels {
-		// TODO: figure out a way to let people specify a fully-qualified name in label-form
-		gvr, err := n.mapper.ResourceFor(schema.GroupVersionResource{Resource: string(label)})
-		if err != nil {
-			if apimeta.IsNoMatchError(err) {
-				continue
-			}
-			return nil, err
-		}
-		res = append(res, gvr.GroupResource())
-	}
-
-	return res, nil
-}
-
-// metricNameFromSeries extracts a metric name from a series name, and indicates
-// whether or not that series was a counter.  It also has special logic to deal with time-based
-// counters, which general get converted to milli-unit rate metrics.
-func (n *metricNamer) metricNameFromSeries(series prom.Series) (name string, kind SeriesType) {
-	kind = GaugeSeries
-	name = series.Name
-	if strings.HasSuffix(name, "_total") {
-		kind = CounterSeries
-		name = name[:len(name)-6]
-
-		if strings.HasSuffix(name, "_seconds") {
-			kind = SecondsCounterSeries
-			name = name[:len(name)-8]
-		}
-	}
-
-	return
-}

pkg/custom-provider/metric_namer_test.go

@@ -1,409 +0,0 @@
-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package provider
-
-import (
-	"sort"
-	"testing"
-
-	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
-	pmodel "github.com/prometheus/common/model"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	coreapi "k8s.io/api/core/v1"
-	extapi "k8s.io/api/extensions/v1beta1"
-	apimeta "k8s.io/apimachinery/pkg/api/meta"
-	"k8s.io/apimachinery/pkg/runtime/schema"
-
-	prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
-)
-
-// restMapper creates a RESTMapper with just the types we need for
-// these tests.
-func restMapper() apimeta.RESTMapper {
-	mapper := apimeta.NewDefaultRESTMapper([]schema.GroupVersion{coreapi.SchemeGroupVersion}, apimeta.InterfacesForUnstructured)
-
-	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Pod"), apimeta.RESTScopeNamespace)
-	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Service"), apimeta.RESTScopeNamespace)
-	mapper.Add(extapi.SchemeGroupVersion.WithKind("Ingress"), apimeta.RESTScopeNamespace)
-	mapper.Add(extapi.SchemeGroupVersion.WithKind("Deployment"), apimeta.RESTScopeNamespace)
-
-	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Node"), apimeta.RESTScopeRoot)
-	mapper.Add(coreapi.SchemeGroupVersion.WithKind("PersistentVolume"), apimeta.RESTScopeRoot)
-	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Namespace"), apimeta.RESTScopeRoot)
-
-	return mapper
-}
-
-func setupMetricNamer(t *testing.T) *metricNamer {
-	return &metricNamer{
-		overrides: map[string]seriesSpec{
-			"container_actually_gauge_seconds_total": {
-				metricName: "actually_gauge",
-				kind:       GaugeSeries,
-			},
-		},
-		mapper: restMapper(),
-	}
-}
-
-func TestMetricNamerContainerSeries(t *testing.T) {
-	testCases := []struct {
-		input            prom.Series
-		outputMetricName string
-		outputInfo       seriesInfo
-	}{
-		{
-			input: prom.Series{
-				Name:   "container_actually_gauge_seconds_total",
-				Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-			},
-			outputMetricName: "actually_gauge",
-			outputInfo: seriesInfo{
-				baseSeries:  prom.Series{Name: "container_actually_gauge_seconds_total"},
-				kind:        GaugeSeries,
-				isContainer: true,
-			},
-		},
-		{
-			input: prom.Series{
-				Name:   "container_some_usage",
-				Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-			},
-			outputMetricName: "some_usage",
-			outputInfo: seriesInfo{
-				baseSeries:  prom.Series{Name: "container_some_usage"},
-				kind:        GaugeSeries,
-				isContainer: true,
-			},
-		},
-		{
-			input: prom.Series{
-				Name:   "container_some_count_total",
-				Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-			},
-			outputMetricName: "some_count",
-			outputInfo: seriesInfo{
-				baseSeries:  prom.Series{Name: "container_some_count_total"},
-				kind:        CounterSeries,
-				isContainer: true,
-			},
-		},
-		{
-			input: prom.Series{
-				Name:   "container_some_time_seconds_total",
-				Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-			},
-			outputMetricName: "some_time",
-			outputInfo: seriesInfo{
-				baseSeries:  prom.Series{Name: "container_some_time_seconds_total"},
-				kind:        SecondsCounterSeries,
-				isContainer: true,
-			},
-		},
-	}
-
-	assert := assert.New(t)
-
-	namer := setupMetricNamer(t)
-	resMap := map[provider.MetricInfo]seriesInfo{}
-
-	for _, test := range testCases {
-		namer.processContainerSeries(test.input, resMap)
-		metric := provider.MetricInfo{
-			Metric:        test.outputMetricName,
-			GroupResource: schema.GroupResource{Resource: "pods"},
-			Namespaced:    true,
-		}
-		if assert.Contains(resMap, metric) {
-			assert.Equal(test.outputInfo, resMap[metric])
-		}
-	}
-}
-
-func TestSeriesRegistry(t *testing.T) {
-	assert := assert.New(t)
-	require := require.New(t)
-
-	namer := setupMetricNamer(t)
-	registry := &basicSeriesRegistry{
-		namer: *namer,
-	}
-
-	inputSeries := []prom.Series{
-		// container series
-		{
-			Name:   "container_actually_gauge_seconds_total",
-			Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-		},
-		{
-			Name:   "container_some_usage",
-			Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-		},
-		{
-			Name:   "container_some_count_total",
-			Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-		},
-		{
-			Name:   "container_some_time_seconds_total",
-			Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-		},
-		// namespaced series
-		// a series that should turn into multiple metrics
-		{
-			Name:   "ingress_hits_total",
-			Labels: pmodel.LabelSet{"ingress": "someingress", "service": "somesvc", "pod": "backend1", "namespace": "somens"},
-		},
-		{
-			Name:   "ingress_hits_total",
-			Labels: pmodel.LabelSet{"ingress": "someingress", "service": "somesvc", "pod": "backend2", "namespace": "somens"},
-		},
-		{
-			Name:   "service_proxy_packets",
-			Labels: pmodel.LabelSet{"service": "somesvc", "namespace": "somens"},
-		},
-		{
-			Name:   "work_queue_wait_seconds_total",
-			Labels: pmodel.LabelSet{"deployment": "somedep", "namespace": "somens"},
-		},
-		// non-namespaced series
-		{
-			Name:   "node_gigawatts",
-			Labels: pmodel.LabelSet{"node": "somenode"},
-		},
-		{
-			Name:   "volume_claims_total",
-			Labels: pmodel.LabelSet{"persistentvolume": "somepv"},
-		},
-		{
-			Name:   "node_fan_seconds_total",
-			Labels: pmodel.LabelSet{"node": "somenode"},
-		},
-		// unrelated series
-		{
-			Name:   "admin_coffee_liters_total",
-			Labels: pmodel.LabelSet{"admin": "some-admin"},
-		},
-		{
-			Name:   "admin_unread_emails",
-			Labels: pmodel.LabelSet{"admin": "some-admin"},
-		},
-		{
-			Name:   "admin_reddit_seconds_total",
-			Labels: pmodel.LabelSet{"admin": "some-admin"},
-		},
-	}
-
-	// set up the registry
-	require.NoError(registry.SetSeries(inputSeries))
-
-	// make sure each metric got registered and can form queries
-	testCases := []struct {
-		title         string
-		info          provider.MetricInfo
-		namespace     string
-		resourceNames []string
-
-		expectedKind    SeriesType
-		expectedQuery   string
-		expectedGroupBy string
-	}{
-		// container metrics
-		{
-			title:         "container metrics overrides / single resource name",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "pods"}, true, "actually_gauge"},
-			namespace:     "somens",
-			resourceNames: []string{"somepod"},
-
-			expectedKind:    GaugeSeries,
-			expectedQuery:   "container_actually_gauge_seconds_total{pod_name=\"somepod\",container_name!=\"POD\",namespace=\"somens\"}",
-			expectedGroupBy: "pod_name",
-		},
-		{
-			title:         "container metrics gauge / multiple resource names",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "pods"}, true, "some_usage"},
-			namespace:     "somens",
-			resourceNames: []string{"somepod1", "somepod2"},
-
-			expectedKind:    GaugeSeries,
-			expectedQuery:   "container_some_usage{pod_name=~\"somepod1|somepod2\",container_name!=\"POD\",namespace=\"somens\"}",
-			expectedGroupBy: "pod_name",
-		},
-		{
-			title:         "container metrics counter",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "pods"}, true, "some_count"},
-			namespace:     "somens",
-			resourceNames: []string{"somepod1", "somepod2"},
-
-			expectedKind:    CounterSeries,
-			expectedQuery:   "container_some_count_total{pod_name=~\"somepod1|somepod2\",container_name!=\"POD\",namespace=\"somens\"}",
-			expectedGroupBy: "pod_name",
-		},
-		{
-			title:         "container metrics seconds counter",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "pods"}, true, "some_time"},
-			namespace:     "somens",
-			resourceNames: []string{"somepod1", "somepod2"},
-
-			expectedKind:    SecondsCounterSeries,
-			expectedQuery:   "container_some_time_seconds_total{pod_name=~\"somepod1|somepod2\",container_name!=\"POD\",namespace=\"somens\"}",
-			expectedGroupBy: "pod_name",
-		},
-		// namespaced metrics
-		{
-			title:         "namespaced metrics counter / multidimensional (service)",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "service"}, true, "ingress_hits"},
-			namespace:     "somens",
-			resourceNames: []string{"somesvc"},
-
-			expectedKind:  CounterSeries,
-			expectedQuery: "ingress_hits_total{service=\"somesvc\",namespace=\"somens\"}",
-		},
-		{
-			title:         "namespaced metrics counter / multidimensional (ingress)",
-			info:          provider.MetricInfo{schema.GroupResource{Group: "extensions", Resource: "ingress"}, true, "ingress_hits"},
-			namespace:     "somens",
-			resourceNames: []string{"someingress"},
-
-			expectedKind:  CounterSeries,
-			expectedQuery: "ingress_hits_total{ingress=\"someingress\",namespace=\"somens\"}",
-		},
-		{
-			title:         "namespaced metrics counter / multidimensional (pod)",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "pod"}, true, "ingress_hits"},
-			namespace:     "somens",
-			resourceNames: []string{"somepod"},
-
-			expectedKind:  CounterSeries,
-			expectedQuery: "ingress_hits_total{pod=\"somepod\",namespace=\"somens\"}",
-		},
-		{
-			title:         "namespaced metrics gauge",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "service"}, true, "service_proxy_packets"},
-			namespace:     "somens",
-			resourceNames: []string{"somesvc"},
-
-			expectedKind:  GaugeSeries,
-			expectedQuery: "service_proxy_packets{service=\"somesvc\",namespace=\"somens\"}",
-		},
-		{
-			title:         "namespaced metrics seconds counter",
-			info:          provider.MetricInfo{schema.GroupResource{Group: "extensions", Resource: "deployment"}, true, "work_queue_wait"},
-			namespace:     "somens",
-			resourceNames: []string{"somedep"},
-
-			expectedKind:  SecondsCounterSeries,
-			expectedQuery: "work_queue_wait_seconds_total{deployment=\"somedep\",namespace=\"somens\"}",
-		},
-		// non-namespaced series
-		{
-			title:         "root scoped metrics gauge",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "node"}, false, "node_gigawatts"},
-			resourceNames: []string{"somenode"},
-
-			expectedKind:  GaugeSeries,
-			expectedQuery: "node_gigawatts{node=\"somenode\"}",
-		},
-		{
-			title:         "root scoped metrics counter",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "persistentvolume"}, false, "volume_claims"},
-			resourceNames: []string{"somepv"},
-
-			expectedKind:  CounterSeries,
-			expectedQuery: "volume_claims_total{persistentvolume=\"somepv\"}",
-		},
-		{
-			title:         "root scoped metrics seconds counter",
-			info:          provider.MetricInfo{schema.GroupResource{Resource: "node"}, false, "node_fan"},
-			resourceNames: []string{"somenode"},
-
-			expectedKind:  SecondsCounterSeries,
-			expectedQuery: "node_fan_seconds_total{node=\"somenode\"}",
-		},
-	}
-
-	for _, testCase := range testCases {
-		outputKind, outputQuery, groupBy, found := registry.QueryForMetric(testCase.info, testCase.namespace, testCase.resourceNames...)
-		if !assert.True(found, "%s: metric %v should available", testCase.title, testCase.info) {
-			continue
-		}
-
-		assert.Equal(testCase.expectedKind, outputKind, "%s: metric %v should have had the right series type", testCase.title, testCase.info)
-		assert.Equal(prom.Selector(testCase.expectedQuery), outputQuery, "%s: metric %v should have produced the correct query for %v in namespace %s", testCase.title, testCase.info, testCase.resourceNames, testCase.namespace)
-
-		expectedGroupBy := testCase.expectedGroupBy
-		if expectedGroupBy == "" {
-			expectedGroupBy = testCase.info.GroupResource.Resource
-		}
-		assert.Equal(expectedGroupBy, groupBy, "%s: metric %v should have produced the correct groupBy clause", testCase.title)
-	}
-
-	allMetrics := registry.ListAllMetrics()
-	expectedMetrics := []provider.MetricInfo{
-		{schema.GroupResource{Resource: "pods"}, true, "actually_gauge"},
-		{schema.GroupResource{Resource: "pods"}, true, "some_usage"},
-		{schema.GroupResource{Resource: "pods"}, true, "some_count"},
-		{schema.GroupResource{Resource: "pods"}, true, "some_time"},
-		{schema.GroupResource{Resource: "services"}, true, "ingress_hits"},
-		{schema.GroupResource{Group: "extensions", Resource: "ingresses"}, true, "ingress_hits"},
-		{schema.GroupResource{Resource: "pods"}, true, "ingress_hits"},
-		{schema.GroupResource{Resource: "namespaces"}, false, "ingress_hits"},
-		{schema.GroupResource{Resource: "services"}, true, "service_proxy_packets"},
-		{schema.GroupResource{Resource: "namespaces"}, false, "service_proxy_packets"},
-		{schema.GroupResource{Group: "extensions", Resource: "deployments"}, true, "work_queue_wait"},
-		{schema.GroupResource{Resource: "namespaces"}, false, "work_queue_wait"},
-		{schema.GroupResource{Resource: "nodes"}, false, "node_gigawatts"},
-		{schema.GroupResource{Resource: "persistentvolumes"}, false, "volume_claims"},
-		{schema.GroupResource{Resource: "nodes"}, false, "node_fan"},
-	}
-
-	// sort both for easy comparison
-	sort.Sort(metricInfoSorter(allMetrics))
-	sort.Sort(metricInfoSorter(expectedMetrics))
-
-	assert.Equal(expectedMetrics, allMetrics, "should have listed all expected metrics")
-}
-
-// metricInfoSorter is a sort.Interface for sorting provider.MetricInfos
-type metricInfoSorter []provider.MetricInfo
-
-func (s metricInfoSorter) Len() int {
-	return len(s)
-}
-
-func (s metricInfoSorter) Less(i, j int) bool {
-	infoI := s[i]
-	infoJ := s[j]
-
-	if infoI.Metric == infoJ.Metric {
-		if infoI.GroupResource == infoJ.GroupResource {
-			return infoI.Namespaced
-		}
-
-		if infoI.GroupResource.Group == infoJ.GroupResource.Group {
-			return infoI.GroupResource.Resource < infoJ.GroupResource.Resource
-		}
-
-		return infoI.GroupResource.Group < infoJ.GroupResource.Group
-	}
-
-	return infoI.Metric < infoJ.Metric
-}
-
-func (s metricInfoSorter) Swap(i, j int) {
-	s[i], s[j] = s[j], s[i]
-}

pkg/custom-provider/provider.go

@@ -19,110 +19,118 @@ package provider
 import (
 	"context"
 	"fmt"
-	"github.com/golang/glog"
+	"math"
 	"time"
 
-	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
 	pmodel "github.com/prometheus/common/model"
+
 	apierr "k8s.io/apimachinery/pkg/api/errors"
 	apimeta "k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/labels"
-	"k8s.io/apimachinery/pkg/runtime"
-	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/types"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/client-go/dynamic"
+	"k8s.io/klog/v2"
 	"k8s.io/metrics/pkg/apis/custom_metrics"
 
-	prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider/helpers"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
 )
 
+// Runnable represents something that can be run until told to stop.
+type Runnable interface {
+	// Run runs the runnable forever.
+	Run()
+	// RunUntil runs the runnable until the given channel is closed.
+	RunUntil(stopChan <-chan struct{})
+}
+
 type prometheusProvider struct {
 	mapper     apimeta.RESTMapper
-	kubeClient dynamic.ClientPool
+	kubeClient dynamic.Interface
 	promClient prom.Client
 
 	SeriesRegistry
-
-	rateInterval time.Duration
 }
 
-func NewPrometheusProvider(mapper apimeta.RESTMapper, kubeClient dynamic.ClientPool, promClient prom.Client, updateInterval time.Duration, rateInterval time.Duration, stopChan <-chan struct{}) provider.CustomMetricsProvider {
+func NewPrometheusProvider(mapper apimeta.RESTMapper, kubeClient dynamic.Interface, promClient prom.Client, namers []naming.MetricNamer, updateInterval time.Duration, maxAge time.Duration) (provider.CustomMetricsProvider, Runnable) {
 	lister := &cachingMetricsLister{
 		updateInterval: updateInterval,
+		maxAge:         maxAge,
 		promClient:     promClient,
+		namers:         namers,
 
 		SeriesRegistry: &basicSeriesRegistry{
-			namer: metricNamer{
-				// TODO: populate the overrides list
-				overrides: nil,
-				mapper:    mapper,
-			},
+			mapper: mapper,
 		},
 	}
 
-	lister.RunUntil(stopChan)
-
 	return &prometheusProvider{
 		mapper:     mapper,
 		kubeClient: kubeClient,
 		promClient: promClient,
 
 		SeriesRegistry: lister,
-
-		rateInterval: rateInterval,
-	}
+	}, lister
 }
 
-func (p *prometheusProvider) metricFor(value pmodel.SampleValue, groupResource schema.GroupResource, namespace string, name string, metricName string) (*custom_metrics.MetricValue, error) {
-	kind, err := p.mapper.KindFor(groupResource.WithVersion(""))
+func (p *prometheusProvider) metricFor(value pmodel.SampleValue, name types.NamespacedName, info provider.CustomMetricInfo, metricSelector labels.Selector) (*custom_metrics.MetricValue, error) {
+	ref, err := helpers.ReferenceFor(p.mapper, name, info)
 	if err != nil {
 		return nil, err
 	}
 
-	return &custom_metrics.MetricValue{
-		DescribedObject: custom_metrics.ObjectReference{
-			APIVersion: groupResource.Group + "/" + runtime.APIVersionInternal,
-			Kind:       kind.Kind,
-			Name:       name,
-			Namespace:  namespace,
-		},
-		MetricName: metricName,
-		Timestamp:  metav1.Time{time.Now()},
-		Value:      *resource.NewMilliQuantity(int64(value*1000.0), resource.DecimalSI),
-	}, nil
-}
-
-func (p *prometheusProvider) metricsFor(valueSet pmodel.Vector, info provider.MetricInfo, list runtime.Object) (*custom_metrics.MetricValueList, error) {
-	if !apimeta.IsListType(list) {
-		return nil, apierr.NewInternalError(fmt.Errorf("result of label selector list operation was not a list"))
+	var q *resource.Quantity
+	if math.IsNaN(float64(value)) {
+		q = resource.NewQuantity(0, resource.DecimalSI)
+	} else {
+		q = resource.NewMilliQuantity(int64(value*1000.0), resource.DecimalSI)
 	}
 
+	metric := &custom_metrics.MetricValue{
+		DescribedObject: ref,
+		Metric: custom_metrics.MetricIdentifier{
+			Name: info.Metric,
+		},
+		// TODO(directxman12): use the right timestamp
+		Timestamp: metav1.Time{Time: time.Now()},
+		Value:     *q,
+	}
+
+	if !metricSelector.Empty() {
+		sel, err := metav1.ParseToLabelSelector(metricSelector.String())
+		if err != nil {
+			return nil, err
+		}
+		metric.Metric.Selector = sel
+	}
+
+	return metric, nil
+}
+
+func (p *prometheusProvider) metricsFor(valueSet pmodel.Vector, namespace string, names []string, info provider.CustomMetricInfo, metricSelector labels.Selector) (*custom_metrics.MetricValueList, error) {
 	values, found := p.MatchValuesToNames(info, valueSet)
 	if !found {
 		return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
 	}
 	res := []custom_metrics.MetricValue{}
 
-	err := apimeta.EachListItem(list, func(item runtime.Object) error {
-		objUnstructured := item.(*unstructured.Unstructured)
-		objName := objUnstructured.GetName()
-		if _, found := values[objName]; !found {
-			return nil
+	for _, name := range names {
+		if _, found := values[name]; !found {
+			continue
 		}
-		value, err := p.metricFor(values[objName], info.GroupResource, objUnstructured.GetNamespace(), objName, info.Metric)
+
+		value, err := p.metricFor(values[name], types.NamespacedName{Namespace: namespace, Name: name}, info, metricSelector)
 		if err != nil {
-			return err
+			return nil, err
 		}
 		res = append(res, *value)
-
-		return nil
-	})
-	if err != nil {
-		return nil, err
 	}
 
 	return &custom_metrics.MetricValueList{
@@ -130,52 +138,38 @@ func (p *prometheusProvider) metricsFor(valueSet pmodel.Vector, info provider.Me
 	}, nil
 }
 
-func (p *prometheusProvider) buildQuery(info provider.MetricInfo, namespace string, names ...string) (pmodel.Vector, error) {
-	kind, baseQuery, groupBy, found := p.QueryForMetric(info, namespace, names...)
+func (p *prometheusProvider) buildQuery(ctx context.Context, info provider.CustomMetricInfo, namespace string, metricSelector labels.Selector, names ...string) (pmodel.Vector, error) {
+	query, found := p.QueryForMetric(info, namespace, metricSelector, names...)
 	if !found {
 		return nil, provider.NewMetricNotFoundError(info.GroupResource, info.Metric)
 	}
 
-	fullQuery := baseQuery
-	switch kind {
-	case CounterSeries:
-		fullQuery = prom.Selector(fmt.Sprintf("rate(%s[%s])", baseQuery, pmodel.Duration(p.rateInterval).String()))
-	case SecondsCounterSeries:
-		// TODO: futher modify for seconds?
-		fullQuery = prom.Selector(prom.Selector(fmt.Sprintf("rate(%s[%s])", baseQuery, pmodel.Duration(p.rateInterval).String())))
-	}
-
-	// NB: too small of a rate interval will return no results...
-
-	// sum over all other dimensions of this query (e.g. if we select on route, sum across all pods,
-	// but if we select on pods, sum across all routes), and split by the dimension of our resource
-	// TODO: return/populate the by list in SeriesForMetric
-	fullQuery = prom.Selector(fmt.Sprintf("sum(%s) by (%s)", fullQuery, groupBy))
-
 	// TODO: use an actual context
-	queryResults, err := p.promClient.Query(context.Background(), pmodel.Now(), fullQuery)
+	queryResults, err := p.promClient.Query(ctx, pmodel.Now(), query)
 	if err != nil {
-		glog.Errorf("unable to fetch metrics from prometheus: %v", err)
+		klog.Errorf("unable to fetch metrics from prometheus: %v", err)
 		// don't leak implementation details to the user
 		return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
 	}
 
 	if queryResults.Type != pmodel.ValVector {
-		glog.Errorf("unexpected results from prometheus: expected %s, got %s on results %v", pmodel.ValVector, queryResults.Type, queryResults)
+		klog.Errorf("unexpected results from prometheus: expected %s, got %s on results %v", pmodel.ValVector, queryResults.Type, queryResults)
 		return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
 	}
 
 	return *queryResults.Vector, nil
 }
 
-func (p *prometheusProvider) getSingle(info provider.MetricInfo, namespace, name string) (*custom_metrics.MetricValue, error) {
-	queryResults, err := p.buildQuery(info, namespace, name)
+func (p *prometheusProvider) GetMetricByName(ctx context.Context, name types.NamespacedName, info provider.CustomMetricInfo, metricSelector labels.Selector) (*custom_metrics.MetricValue, error) {
+	// construct a query
+	queryResults, err := p.buildQuery(ctx, info, name.Namespace, metricSelector, name.Name)
 	if err != nil {
 		return nil, err
 	}
 
+	// associate the metrics
 	if len(queryResults) < 1 {
-		return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name)
+		return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name.Name)
 	}
 
 	namedValues, found := p.MatchValuesToNames(info, queryResults)
@@ -184,99 +178,36 @@ func (p *prometheusProvider) getSingle(info provider.MetricInfo, namespace, name
 	}
 
 	if len(namedValues) > 1 {
-		glog.V(2).Infof("Got more than one result (%v results) when fetching metric %s for %q, using the first one with a matching name...", len(queryResults), info.String(), name)
+		klog.V(2).Infof("Got more than one result (%v results) when fetching metric %s for %q, using the first one with a matching name...", len(queryResults), info.String(), name)
 	}
 
-	resultValue, nameFound := namedValues[name]
+	resultValue, nameFound := namedValues[name.Name]
 	if !nameFound {
-		glog.Errorf("None of the results returned by when fetching metric %s for %q matched the resource name", info.String(), name)
-		return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name)
+		klog.Errorf("None of the results returned by when fetching metric %s for %q matched the resource name", info.String(), name)
+		return nil, provider.NewMetricNotFoundForError(info.GroupResource, info.Metric, name.Name)
 	}
 
-	return p.metricFor(resultValue, info.GroupResource, "", name, info.Metric)
+	// return the resulting metric
+	return p.metricFor(resultValue, name, info, metricSelector)
 }
 
-func (p *prometheusProvider) getMultiple(info provider.MetricInfo, namespace string, selector labels.Selector) (*custom_metrics.MetricValueList, error) {
-	// construct a client to list the names of objects matching the label selector
-	client, err := p.kubeClient.ClientForGroupVersionResource(info.GroupResource.WithVersion(""))
+func (p *prometheusProvider) GetMetricBySelector(ctx context.Context, namespace string, selector labels.Selector, info provider.CustomMetricInfo, metricSelector labels.Selector) (*custom_metrics.MetricValueList, error) {
+	// fetch a list of relevant resource names
+	resourceNames, err := helpers.ListObjectNames(p.mapper, p.kubeClient, namespace, selector, info)
 	if err != nil {
-		glog.Errorf("unable to construct dynamic client to list matching resource names: %v", err)
+		klog.Errorf("unable to list matching resource names: %v", err)
 		// don't leak implementation details to the user
 		return nil, apierr.NewInternalError(fmt.Errorf("unable to list matching resources"))
 	}
 
-	// we can construct a this APIResource ourself, since the dynamic client only uses Name and Namespaced
-	apiRes := &metav1.APIResource{
-		Name:       info.GroupResource.Resource,
-		Namespaced: info.Namespaced,
-	}
-
-	// actually list the objects matching the label selector
-	matchingObjectsRaw, err := client.Resource(apiRes, namespace).
-		List(metav1.ListOptions{LabelSelector: selector.String()})
-	if err != nil {
-		glog.Errorf("unable to list matching resource names: %v", err)
-		// don't leak implementation details to the user
-		return nil, apierr.NewInternalError(fmt.Errorf("unable to list matching resources"))
-	}
-
-	// make sure we have a list
-	if !apimeta.IsListType(matchingObjectsRaw) {
-		return nil, apierr.NewInternalError(fmt.Errorf("result of label selector list operation was not a list"))
-	}
-
-	// convert a list of objects into the corresponding list of names
-	resourceNames := []string{}
-	err = apimeta.EachListItem(matchingObjectsRaw, func(item runtime.Object) error {
-		objName := item.(*unstructured.Unstructured).GetName()
-		resourceNames = append(resourceNames, objName)
-		return nil
-	})
-
 	// construct the actual query
-	queryResults, err := p.buildQuery(info, namespace, resourceNames...)
+	queryResults, err := p.buildQuery(ctx, info, namespace, metricSelector, resourceNames...)
 	if err != nil {
 		return nil, err
 	}
-	return p.metricsFor(queryResults, info, matchingObjectsRaw)
-}
 
-func (p *prometheusProvider) GetRootScopedMetricByName(groupResource schema.GroupResource, name string, metricName string) (*custom_metrics.MetricValue, error) {
-	info := provider.MetricInfo{
-		GroupResource: groupResource,
-		Metric:        metricName,
-		Namespaced:    false,
-	}
-
-	return p.getSingle(info, "", name)
-}
-
-func (p *prometheusProvider) GetRootScopedMetricBySelector(groupResource schema.GroupResource, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error) {
-	info := provider.MetricInfo{
-		GroupResource: groupResource,
-		Metric:        metricName,
-		Namespaced:    false,
-	}
-	return p.getMultiple(info, "", selector)
-}
-
-func (p *prometheusProvider) GetNamespacedMetricByName(groupResource schema.GroupResource, namespace string, name string, metricName string) (*custom_metrics.MetricValue, error) {
-	info := provider.MetricInfo{
-		GroupResource: groupResource,
-		Metric:        metricName,
-		Namespaced:    true,
-	}
-
-	return p.getSingle(info, namespace, name)
-}
-
-func (p *prometheusProvider) GetNamespacedMetricBySelector(groupResource schema.GroupResource, namespace string, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error) {
-	info := provider.MetricInfo{
-		GroupResource: groupResource,
-		Metric:        metricName,
-		Namespaced:    true,
-	}
-	return p.getMultiple(info, namespace, selector)
+	// return the resulting metrics
+	return p.metricsFor(queryResults, namespace, resourceNames, info, metricSelector)
 }
 
 type cachingMetricsLister struct {
@@ -284,6 +215,8 @@ type cachingMetricsLister struct {
 
 	promClient     prom.Client
 	updateInterval time.Duration
+	maxAge         time.Duration
+	namers         []naming.MetricNamer
 }
 
 func (l *cachingMetricsLister) Run() {
@@ -298,23 +231,65 @@ func (l *cachingMetricsLister) RunUntil(stopChan <-chan struct{}) {
 	}, l.updateInterval, stopChan)
 }
 
+type selectorSeries struct {
+	selector prom.Selector
+	series   []prom.Series
+}
+
 func (l *cachingMetricsLister) updateMetrics() error {
-	startTime := pmodel.Now().Add(-1 * l.updateInterval)
+	startTime := pmodel.Now().Add(-1 * l.maxAge)
 
-	// container-specific metrics from cAdvsior have their own form, and need special handling
-	containerSel := prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container_name", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod_name", ""))
-	namespacedSel := prom.MatchSeries("", prom.LabelNeq("namespace", ""), prom.NameNotMatches("^container_.*"))
-	// TODO: figure out how to determine which metrics on non-namespaced objects are kubernetes-related
+	// don't do duplicate queries when it's just the matchers that change
+	seriesCacheByQuery := make(map[prom.Selector][]prom.Series)
 
-	// TODO: use an actual context here
-	series, err := l.promClient.Series(context.Background(), pmodel.Interval{startTime, 0}, containerSel, namespacedSel)
-	if err != nil {
-		return fmt.Errorf("unable to update list of all available metrics: %v", err)
+	// these can take a while on large clusters, so launch in parallel
+	// and don't duplicate
+	selectors := make(map[prom.Selector]struct{})
+	selectorSeriesChan := make(chan selectorSeries, len(l.namers))
+	errs := make(chan error, len(l.namers))
+	for _, namer := range l.namers {
+		sel := namer.Selector()
+		if _, ok := selectors[sel]; ok {
+			errs <- nil
+			selectorSeriesChan <- selectorSeries{}
+			continue
+		}
+		selectors[sel] = struct{}{}
+		go func() {
+			series, err := l.promClient.Series(context.TODO(), pmodel.Interval{Start: startTime, End: 0}, sel)
+			if err != nil {
+				errs <- fmt.Errorf("unable to fetch metrics for query %q: %v", sel, err)
+				return
+			}
+			errs <- nil
+			selectorSeriesChan <- selectorSeries{
+				selector: sel,
+				series:   series,
+			}
+		}()
 	}
 
-	glog.V(10).Infof("Set available metric list from Prometheus to: %v", series)
+	// iterate through, blocking until we've got all results
+	for range l.namers {
+		if err := <-errs; err != nil {
+			return fmt.Errorf("unable to update list of all metrics: %v", err)
+		}
+		if ss := <-selectorSeriesChan; ss.series != nil {
+			seriesCacheByQuery[ss.selector] = ss.series
+		}
+	}
+	close(errs)
 
-	l.SetSeries(series)
+	newSeries := make([][]prom.Series, len(l.namers))
+	for i, namer := range l.namers {
+		series, cached := seriesCacheByQuery[namer.Selector()]
+		if !cached {
+			return fmt.Errorf("unable to update list of all metrics: no metrics retrieved for query %q", namer.Selector())
+		}
+		newSeries[i] = namer.FilterSeries(series)
+	}
 
-	return nil
+	klog.V(10).Infof("Set available metric list from Prometheus to: %v", newSeries)
+
+	return l.SetSeries(newSeries, l.namers)
 }

pkg/custom-provider/provider_suite_test.go

@@ -0,0 +1,29 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider_test
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestProvider(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Custom Metrics Provider Suite")
+}

pkg/custom-provider/provider_test.go

@@ -17,92 +17,43 @@ limitations under the License.
 package provider
 
 import (
-	"context"
-	"fmt"
-	"sort"
-	"testing"
 	"time"
 
-	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	pmodel "github.com/prometheus/common/model"
+
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	fakedyn "k8s.io/client-go/dynamic/fake"
 
-	prom "github.com/directxman12/k8s-prometheus-adapter/pkg/client"
-	pmodel "github.com/prometheus/common/model"
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+
+	config "sigs.k8s.io/prometheus-adapter/cmd/config-gen/utils"
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	fakeprom "sigs.k8s.io/prometheus-adapter/pkg/client/fake"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
 )
 
 const fakeProviderUpdateInterval = 2 * time.Second
+const fakeProviderStartDuration = 2 * time.Second
 
-// fakePromClient is a fake instance of prom.Client
-type fakePromClient struct {
-	// acceptibleInterval is the interval in which to return queries
-	acceptibleInterval pmodel.Interval
-	// errQueries are queries that result in an error (whether from Query or Series)
-	errQueries map[prom.Selector]error
-	// series are non-error responses to partial Series calls
-	series map[prom.Selector][]prom.Series
-	// queryResults are non-error responses to Query
-	queryResults map[prom.Selector]prom.QueryResult
-}
+func setupPrometheusProvider() (provider.CustomMetricsProvider, *fakeprom.FakePrometheusClient) {
+	fakeProm := &fakeprom.FakePrometheusClient{}
+	fakeKubeClient := &fakedyn.FakeDynamicClient{}
 
-func (c *fakePromClient) Series(_ context.Context, interval pmodel.Interval, selectors ...prom.Selector) ([]prom.Series, error) {
-	if (interval.Start != 0 && interval.Start < c.acceptibleInterval.Start) || (interval.End != 0 && interval.End > c.acceptibleInterval.End) {
-		return nil, fmt.Errorf("interval [%v, %v] for query is outside range [%v, %v]", interval.Start, interval.End, c.acceptibleInterval.Start, c.acceptibleInterval.End)
-	}
-	res := []prom.Series{}
-	for _, sel := range selectors {
-		if err, found := c.errQueries[sel]; found {
-			return nil, err
-		}
-		if series, found := c.series[sel]; found {
-			res = append(res, series...)
-		}
-	}
+	cfg := config.DefaultConfig(1*time.Minute, "")
+	namers, err := naming.NamersFromConfig(cfg.Rules, restMapper())
+	Expect(err).NotTo(HaveOccurred())
 
-	return res, nil
-}
+	prov, _ := NewPrometheusProvider(restMapper(), fakeKubeClient, fakeProm, namers, fakeProviderUpdateInterval, fakeProviderStartDuration)
 
-func (c *fakePromClient) Query(_ context.Context, t pmodel.Time, query prom.Selector) (prom.QueryResult, error) {
-	if t < c.acceptibleInterval.Start || t > c.acceptibleInterval.End {
-		return prom.QueryResult{}, fmt.Errorf("time %v for query is outside range [%v, %v]", t, c.acceptibleInterval.Start, c.acceptibleInterval.End)
-	}
-
-	if err, found := c.errQueries[query]; found {
-		return prom.QueryResult{}, err
-	}
-
-	if res, found := c.queryResults[query]; found {
-		return res, nil
-	}
-
-	return prom.QueryResult{
-		Type:   pmodel.ValVector,
-		Vector: &pmodel.Vector{},
-	}, nil
-}
-func (c *fakePromClient) QueryRange(_ context.Context, r prom.Range, query prom.Selector) (prom.QueryResult, error) {
-	return prom.QueryResult{}, nil
-}
-
-func setupPrometheusProvider(t *testing.T, stopCh <-chan struct{}) (provider.CustomMetricsProvider, *fakePromClient) {
-	fakeProm := &fakePromClient{}
-	fakeKubeClient := &fakedyn.FakeClientPool{}
-
-	prov := NewPrometheusProvider(restMapper(), fakeKubeClient, fakeProm, fakeProviderUpdateInterval, 1*time.Minute, stopCh)
-
-	containerSel := prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container_name", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod_name", ""))
+	containerSel := prom.MatchSeries("", prom.NameMatches("^container_.*"), prom.LabelNeq("container", "POD"), prom.LabelNeq("namespace", ""), prom.LabelNeq("pod", ""))
 	namespacedSel := prom.MatchSeries("", prom.LabelNeq("namespace", ""), prom.NameNotMatches("^container_.*"))
-	fakeProm.series = map[prom.Selector][]prom.Series{
+	fakeProm.SeriesResults = map[prom.Selector][]prom.Series{
 		containerSel: {
-			{
-				Name:   "container_actually_gauge_seconds_total",
-				Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
-			},
 			{
 				Name:   "container_some_usage",
-				Labels: pmodel.LabelSet{"pod_name": "somepod", "namespace": "somens", "container_name": "somecont"},
+				Labels: pmodel.LabelSet{"pod": "somepod", "namespace": "somens", "container": "somecont"},
 			},
 		},
 		namespacedSel: {
@@ -128,41 +79,35 @@ func setupPrometheusProvider(t *testing.T, stopCh <-chan struct{}) (provider.Cus
 	return prov, fakeProm
 }
 
-func TestListAllMetrics(t *testing.T) {
-	// setup
-	stopCh := make(chan struct{})
-	defer close(stopCh)
-	prov, fakeProm := setupPrometheusProvider(t, stopCh)
+var _ = Describe("Custom Metrics Provider", func() {
+	It("should be able to list all metrics", func() {
+		By("setting up the provider")
+		prov, fakeProm := setupPrometheusProvider()
 
-	// assume we have no updates
-	require.Len(t, prov.ListAllMetrics(), 0, "assume: should have no metrics updates at the start")
+		By("ensuring that no metrics are present before we start listing")
+		Expect(prov.ListAllMetrics()).To(BeEmpty())
 
-	// set the acceptible interval (now until the next update, with a bit of wiggle room)
-	startTime := pmodel.Now()
-	endTime := startTime.Add(fakeProviderUpdateInterval + fakeProviderUpdateInterval/10)
-	fakeProm.acceptibleInterval = pmodel.Interval{Start: startTime, End: endTime}
+		By("setting the acceptable interval to now until the next update, with a bit of wiggle room")
+		startTime := pmodel.Now().Add(-1*fakeProviderUpdateInterval - fakeProviderUpdateInterval/10)
+		fakeProm.AcceptableInterval = pmodel.Interval{Start: startTime, End: 0}
 
-	// wait one update interval (with a bit of wiggle room)
-	time.Sleep(fakeProviderUpdateInterval + fakeProviderUpdateInterval/10)
+		By("updating the list of available metrics")
+		// don't call RunUntil to avoid timing issue
+		lister := prov.(*prometheusProvider).SeriesRegistry.(*cachingMetricsLister)
+		Expect(lister.updateMetrics()).To(Succeed())
 
-	// list/sort the metrics
-	actualMetrics := prov.ListAllMetrics()
-	sort.Sort(metricInfoSorter(actualMetrics))
-
-	expectedMetrics := []provider.MetricInfo{
-		{schema.GroupResource{Resource: "pods"}, true, "actually_gauge"},
-		{schema.GroupResource{Resource: "pods"}, true, "some_usage"},
-		{schema.GroupResource{Resource: "services"}, true, "ingress_hits"},
-		{schema.GroupResource{Group: "extensions", Resource: "ingresses"}, true, "ingress_hits"},
-		{schema.GroupResource{Resource: "pods"}, true, "ingress_hits"},
-		{schema.GroupResource{Resource: "namespaces"}, false, "ingress_hits"},
-		{schema.GroupResource{Resource: "services"}, true, "service_proxy_packets"},
-		{schema.GroupResource{Resource: "namespaces"}, false, "service_proxy_packets"},
-		{schema.GroupResource{Group: "extensions", Resource: "deployments"}, true, "work_queue_wait"},
-		{schema.GroupResource{Resource: "namespaces"}, false, "work_queue_wait"},
-	}
-	sort.Sort(metricInfoSorter(expectedMetrics))
-
-	// assert that we got what we expected
-	assert.Equal(t, expectedMetrics, actualMetrics)
-}
+		By("listing all metrics, and checking that they contain the expected results")
+		Expect(prov.ListAllMetrics()).To(ConsistOf(
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "services"}, Namespaced: true, Metric: "ingress_hits"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Group: "extensions", Resource: "ingresses"}, Namespaced: true, Metric: "ingress_hits"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "ingress_hits"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "ingress_hits"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "services"}, Namespaced: true, Metric: "service_proxy_packets"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "service_proxy_packets"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Group: "extensions", Resource: "deployments"}, Namespaced: true, Metric: "work_queue_wait"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "work_queue_wait"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "some_usage"},
+			provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "some_usage"},
+		))
+	})
+})

pkg/custom-provider/series_registry.go

@@ -0,0 +1,202 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"fmt"
+	"sync"
+
+	pmodel "github.com/prometheus/common/model"
+
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/klog/v2"
+
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
+)
+
+// NB: container metrics sourced from cAdvisor don't consistently follow naming conventions,
+// so we need to whitelist them and handle them on a case-by-case basis.  Metrics ending in `_total`
+// *should* be counters, but may actually be guages in this case.
+
+// SeriesType represents the kind of series backing a metric.
+type SeriesType int
+
+const (
+	CounterSeries SeriesType = iota
+	SecondsCounterSeries
+	GaugeSeries
+)
+
+// SeriesRegistry provides conversions between Prometheus series and MetricInfo
+type SeriesRegistry interface {
+	// SetSeries replaces the known series in this registry.
+	// Each slice in series should correspond to a MetricNamer in namers.
+	SetSeries(series [][]prom.Series, namers []naming.MetricNamer) error
+	// ListAllMetrics lists all metrics known to this registry
+	ListAllMetrics() []provider.CustomMetricInfo
+	// SeriesForMetric looks up the minimum required series information to make a query for the given metric
+	// against the given resource (namespace may be empty for non-namespaced resources)
+	QueryForMetric(info provider.CustomMetricInfo, namespace string, metricSelector labels.Selector, resourceNames ...string) (query prom.Selector, found bool)
+	// MatchValuesToNames matches result values to resource names for the given metric and value set
+	MatchValuesToNames(metricInfo provider.CustomMetricInfo, values pmodel.Vector) (matchedValues map[string]pmodel.SampleValue, found bool)
+}
+
+type seriesInfo struct {
+	// seriesName is the name of the corresponding Prometheus series
+	seriesName string
+
+	// namer is the MetricNamer used to name this series
+	namer naming.MetricNamer
+}
+
+// overridableSeriesRegistry is a basic SeriesRegistry
+type basicSeriesRegistry struct {
+	mu sync.RWMutex
+
+	// info maps metric info to information about the corresponding series
+	info map[provider.CustomMetricInfo]seriesInfo
+	// metrics is the list of all known metrics
+	metrics []provider.CustomMetricInfo
+
+	mapper apimeta.RESTMapper
+}
+
+func (r *basicSeriesRegistry) SetSeries(newSeriesSlices [][]prom.Series, namers []naming.MetricNamer) error {
+	if len(newSeriesSlices) != len(namers) {
+		return fmt.Errorf("need one set of series per namer")
+	}
+
+	newInfo := make(map[provider.CustomMetricInfo]seriesInfo)
+	for i, newSeries := range newSeriesSlices {
+		namer := namers[i]
+		for _, series := range newSeries {
+			// TODO: warn if it doesn't match any resources
+			resources, namespaced := namer.ResourcesForSeries(series)
+			name, err := namer.MetricNameForSeries(series)
+			if err != nil {
+				klog.Errorf("unable to name series %q, skipping: %v", series.String(), err)
+				continue
+			}
+			for _, resource := range resources {
+				info := provider.CustomMetricInfo{
+					GroupResource: resource,
+					Namespaced:    namespaced,
+					Metric:        name,
+				}
+
+				// some metrics aren't counted as namespaced
+				if resource == naming.NsGroupResource || resource == naming.NodeGroupResource || resource == naming.PVGroupResource {
+					info.Namespaced = false
+				}
+
+				// we don't need to re-normalize, because the metric namer should have already normalized for us
+				newInfo[info] = seriesInfo{
+					seriesName: series.Name,
+					namer:      namer,
+				}
+			}
+		}
+	}
+
+	// regenerate metrics
+	newMetrics := make([]provider.CustomMetricInfo, 0, len(newInfo))
+	for info := range newInfo {
+		newMetrics = append(newMetrics, info)
+	}
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	r.info = newInfo
+	r.metrics = newMetrics
+
+	return nil
+}
+
+func (r *basicSeriesRegistry) ListAllMetrics() []provider.CustomMetricInfo {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	return r.metrics
+}
+
+func (r *basicSeriesRegistry) QueryForMetric(metricInfo provider.CustomMetricInfo, namespace string, metricSelector labels.Selector, resourceNames ...string) (prom.Selector, bool) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	if len(resourceNames) == 0 {
+		klog.Errorf("no resource names requested while producing a query for metric %s", metricInfo.String())
+		return "", false
+	}
+
+	metricInfo, _, err := metricInfo.Normalized(r.mapper)
+	if err != nil {
+		klog.Errorf("unable to normalize group resource while producing a query: %v", err)
+		return "", false
+	}
+
+	info, infoFound := r.info[metricInfo]
+	if !infoFound {
+		klog.V(10).Infof("metric %v not registered", metricInfo)
+		return "", false
+	}
+
+	query, err := info.namer.QueryForSeries(info.seriesName, metricInfo.GroupResource, namespace, metricSelector, resourceNames...)
+	if err != nil {
+		klog.Errorf("unable to construct query for metric %s: %v", metricInfo.String(), err)
+		return "", false
+	}
+
+	return query, true
+}
+
+func (r *basicSeriesRegistry) MatchValuesToNames(metricInfo provider.CustomMetricInfo, values pmodel.Vector) (matchedValues map[string]pmodel.SampleValue, found bool) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	metricInfo, _, err := metricInfo.Normalized(r.mapper)
+	if err != nil {
+		klog.Errorf("unable to normalize group resource while matching values to names: %v", err)
+		return nil, false
+	}
+
+	info, infoFound := r.info[metricInfo]
+	if !infoFound {
+		return nil, false
+	}
+
+	resourceLbl, err := info.namer.LabelForResource(metricInfo.GroupResource)
+	if err != nil {
+		klog.Errorf("unable to construct resource label for metric %s: %v", metricInfo.String(), err)
+		return nil, false
+	}
+
+	res := make(map[string]pmodel.SampleValue, len(values))
+	for _, val := range values {
+		if val == nil {
+			// skip empty values
+			continue
+		}
+		res[string(val.Metric[resourceLbl])] = val.Value
+	}
+
+	return res, true
+}

pkg/custom-provider/series_registry_test.go

@@ -0,0 +1,304 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"fmt"
+	"time"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	pmodel "github.com/prometheus/common/model"
+
+	coreapi "k8s.io/api/core/v1"
+	extapi "k8s.io/api/extensions/v1beta1"
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/selection"
+
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+
+	config "sigs.k8s.io/prometheus-adapter/cmd/config-gen/utils"
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
+)
+
+// restMapper creates a RESTMapper with just the types we need for
+// these tests.
+func restMapper() apimeta.RESTMapper {
+	mapper := apimeta.NewDefaultRESTMapper([]schema.GroupVersion{coreapi.SchemeGroupVersion})
+
+	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Pod"), apimeta.RESTScopeNamespace)
+	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Service"), apimeta.RESTScopeNamespace)
+	mapper.Add(extapi.SchemeGroupVersion.WithKind("Ingress"), apimeta.RESTScopeNamespace)
+	mapper.Add(extapi.SchemeGroupVersion.WithKind("Deployment"), apimeta.RESTScopeNamespace)
+
+	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Node"), apimeta.RESTScopeRoot)
+	mapper.Add(coreapi.SchemeGroupVersion.WithKind("PersistentVolume"), apimeta.RESTScopeRoot)
+	mapper.Add(coreapi.SchemeGroupVersion.WithKind("Namespace"), apimeta.RESTScopeRoot)
+
+	return mapper
+}
+
+func setupMetricNamer() []naming.MetricNamer {
+	cfg := config.DefaultConfig(1*time.Minute, "kube_")
+	namers, err := naming.NamersFromConfig(cfg.Rules, restMapper())
+	Expect(err).NotTo(HaveOccurred())
+	return namers
+}
+
+var seriesRegistryTestSeries = [][]prom.Series{
+	// container series
+	{
+		{
+			Name:   "container_some_time_seconds_total",
+			Labels: pmodel.LabelSet{"pod": "somepod", "namespace": "somens", "container": "somecont"},
+		},
+	},
+	{
+		{
+			Name:   "container_some_count_total",
+			Labels: pmodel.LabelSet{"pod": "somepod", "namespace": "somens", "container": "somecont"},
+		},
+	},
+	{
+		{
+			Name:   "container_some_usage",
+			Labels: pmodel.LabelSet{"pod": "somepod", "namespace": "somens", "container": "somecont"},
+		},
+	},
+	{
+		// gauge metrics
+		{
+			Name:   "node_gigawatts",
+			Labels: pmodel.LabelSet{"kube_node": "somenode"},
+		},
+		{
+			Name:   "service_proxy_packets",
+			Labels: pmodel.LabelSet{"kube_service": "somesvc", "kube_namespace": "somens"},
+		},
+	},
+	{
+		// cumulative --> rate metrics
+		{
+			Name:   "ingress_hits_total",
+			Labels: pmodel.LabelSet{"kube_ingress": "someingress", "kube_service": "somesvc", "kube_pod": "backend1", "kube_namespace": "somens"},
+		},
+		{
+			Name:   "ingress_hits_total",
+			Labels: pmodel.LabelSet{"kube_ingress": "someingress", "kube_service": "somesvc", "kube_pod": "backend2", "kube_namespace": "somens"},
+		},
+		{
+			Name:   "volume_claims_total",
+			Labels: pmodel.LabelSet{"kube_persistentvolume": "somepv"},
+		},
+	},
+	{
+		// cumulative seconds --> rate metrics
+		{
+			Name:   "work_queue_wait_seconds_total",
+			Labels: pmodel.LabelSet{"kube_deployment": "somedep", "kube_namespace": "somens"},
+		},
+		{
+			Name:   "node_fan_seconds_total",
+			Labels: pmodel.LabelSet{"kube_node": "somenode"},
+		},
+	},
+}
+
+type regTestCase struct {
+	title          string
+	info           provider.CustomMetricInfo
+	namespace      string
+	resourceNames  []string
+	metricSelector labels.Selector
+
+	expectedQuery string
+}
+
+func mustNewLabelRequirement(key string, op selection.Operator, vals []string) *labels.Requirement {
+	req, err := labels.NewRequirement(key, op, vals)
+	if err != nil {
+		panic(err)
+	}
+	return req
+}
+
+var _ = Describe("Series Registry", func() {
+	var (
+		registry *basicSeriesRegistry
+	)
+
+	BeforeEach(func() {
+		namers := setupMetricNamer()
+		registry = &basicSeriesRegistry{
+			mapper: restMapper(),
+		}
+		Expect(registry.SetSeries(seriesRegistryTestSeries, namers)).To(Succeed())
+	})
+
+	Context("with the default configuration rules", func() {
+		// make sure each metric got registered and can form queries
+		testCases := []regTestCase{
+			// container metrics
+			{
+				title:          "container metrics gauge / multiple resource names",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "some_usage"},
+				namespace:      "somens",
+				resourceNames:  []string{"somepod1", "somepod2"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(container_some_usage{namespace=\"somens\",pod=~\"somepod1|somepod2\",container!=\"POD\"}) by (pod)",
+			},
+			{
+				title:          "container metrics counter",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "some_count"},
+				namespace:      "somens",
+				resourceNames:  []string{"somepod1", "somepod2"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(container_some_count_total{namespace=\"somens\",pod=~\"somepod1|somepod2\",container!=\"POD\"}[1m])) by (pod)",
+			},
+			{
+				title:          "container metrics seconds counter",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "some_time"},
+				namespace:      "somens",
+				resourceNames:  []string{"somepod1", "somepod2"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(container_some_time_seconds_total{namespace=\"somens\",pod=~\"somepod1|somepod2\",container!=\"POD\"}[1m])) by (pod)",
+			},
+			// namespaced metrics
+			{
+				title:          "namespaced metrics counter / multidimensional (service)",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "service"}, Namespaced: true, Metric: "ingress_hits"},
+				namespace:      "somens",
+				resourceNames:  []string{"somesvc"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(ingress_hits_total{kube_namespace=\"somens\",kube_service=\"somesvc\"}[1m])) by (kube_service)",
+			},
+			{
+				title:         "namespaced metrics counter /  multidimensional (service) / selection using labels",
+				info:          provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "service"}, Namespaced: true, Metric: "ingress_hits"},
+				namespace:     "somens",
+				resourceNames: []string{"somesvc"},
+				metricSelector: labels.NewSelector().Add(
+					*mustNewLabelRequirement("param1", selection.Equals, []string{"value1"}),
+				),
+				expectedQuery: "sum(rate(ingress_hits_total{param1=\"value1\",kube_namespace=\"somens\",kube_service=\"somesvc\"}[1m])) by (kube_service)",
+			},
+			{
+				title:          "namespaced metrics counter / multidimensional (ingress)",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Group: "extensions", Resource: "ingress"}, Namespaced: true, Metric: "ingress_hits"},
+				namespace:      "somens",
+				resourceNames:  []string{"someingress"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(ingress_hits_total{kube_namespace=\"somens\",kube_ingress=\"someingress\"}[1m])) by (kube_ingress)",
+			},
+			{
+				title:          "namespaced metrics counter / multidimensional (pod)",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pod"}, Namespaced: true, Metric: "ingress_hits"},
+				namespace:      "somens",
+				resourceNames:  []string{"somepod"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(ingress_hits_total{kube_namespace=\"somens\",kube_pod=\"somepod\"}[1m])) by (kube_pod)",
+			},
+			{
+				title:          "namespaced metrics gauge",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "service"}, Namespaced: true, Metric: "service_proxy_packets"},
+				namespace:      "somens",
+				resourceNames:  []string{"somesvc"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(service_proxy_packets{kube_namespace=\"somens\",kube_service=\"somesvc\"}) by (kube_service)",
+			},
+			{
+				title:          "namespaced metrics seconds counter",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Group: "extensions", Resource: "deployment"}, Namespaced: true, Metric: "work_queue_wait"},
+				namespace:      "somens",
+				resourceNames:  []string{"somedep"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(work_queue_wait_seconds_total{kube_namespace=\"somens\",kube_deployment=\"somedep\"}[1m])) by (kube_deployment)",
+			},
+			// non-namespaced series
+			{
+				title:          "root scoped metrics gauge",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "node"}, Namespaced: false, Metric: "node_gigawatts"},
+				resourceNames:  []string{"somenode"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(node_gigawatts{kube_node=\"somenode\"}) by (kube_node)",
+			},
+			{
+				title:          "root scoped metrics counter",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "persistentvolume"}, Namespaced: false, Metric: "volume_claims"},
+				resourceNames:  []string{"somepv"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(volume_claims_total{kube_persistentvolume=\"somepv\"}[1m])) by (kube_persistentvolume)",
+			},
+			{
+				title:          "root scoped metrics seconds counter",
+				info:           provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "node"}, Namespaced: false, Metric: "node_fan"},
+				resourceNames:  []string{"somenode"},
+				metricSelector: labels.Everything(),
+
+				expectedQuery: "sum(rate(node_fan_seconds_total{kube_node=\"somenode\"}[1m])) by (kube_node)",
+			},
+		}
+
+		for _, tc := range testCases {
+			tc := tc // copy to avoid iteration variable issues
+			It(fmt.Sprintf("should build a query for %s", tc.title), func() {
+				By(fmt.Sprintf("composing the query for the %s metric on %v in namespace %s", tc.info, tc.resourceNames, tc.namespace))
+				outputQuery, found := registry.QueryForMetric(tc.info, tc.namespace, tc.metricSelector, tc.resourceNames...)
+				Expect(found).To(BeTrue(), "metric %s should be available", tc.info)
+
+				By("verifying that the query is as expected")
+				Expect(outputQuery).To(Equal(prom.Selector(tc.expectedQuery)))
+			})
+		}
+
+		It("should list all metrics", func() {
+			Expect(registry.ListAllMetrics()).To(ConsistOf(
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "some_count"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "some_count"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "some_time"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "some_time"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "some_usage"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "some_usage"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "services"}, Namespaced: true, Metric: "ingress_hits"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Group: "extensions", Resource: "ingresses"}, Namespaced: true, Metric: "ingress_hits"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "pods"}, Namespaced: true, Metric: "ingress_hits"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "ingress_hits"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "services"}, Namespaced: true, Metric: "service_proxy_packets"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "service_proxy_packets"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Group: "extensions", Resource: "deployments"}, Namespaced: true, Metric: "work_queue_wait"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "namespaces"}, Namespaced: false, Metric: "work_queue_wait"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "nodes"}, Namespaced: false, Metric: "node_gigawatts"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "persistentvolumes"}, Namespaced: false, Metric: "volume_claims"},
+				provider.CustomMetricInfo{GroupResource: schema.GroupResource{Resource: "nodes"}, Namespaced: false, Metric: "node_fan"},
+			))
+		})
+	})
+})

pkg/external-provider/basic_metric_lister.go

@@ -0,0 +1,167 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"k8s.io/klog/v2"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
+
+	pmodel "github.com/prometheus/common/model"
+)
+
+// Runnable represents something that can be run until told to stop.
+type Runnable interface {
+	// Run runs the runnable forever.
+	Run()
+	// RunUntil runs the runnable until the given channel is closed.
+	RunUntil(stopChan <-chan struct{})
+}
+
+// A MetricLister provides a window into all of the metrics that are available within a given
+// Prometheus instance, classified as either Custom or External metrics, but presented generically
+// so that it can manage both types simultaneously.
+type MetricLister interface {
+	ListAllMetrics() (MetricUpdateResult, error)
+}
+
+// A MetricListerWithNotification is a MetricLister that has the ability to notify listeners
+// when new metric data is available.
+type MetricListerWithNotification interface {
+	MetricLister
+	Runnable
+
+	// AddNotificationReceiver registers a callback to be invoked when new metric data is available.
+	AddNotificationReceiver(MetricUpdateCallback)
+	// UpdateNow forces an immediate refresh from the source data. Primarily for test purposes.
+	UpdateNow()
+}
+
+type basicMetricLister struct {
+	promClient prom.Client
+	namers     []naming.MetricNamer
+	lookback   time.Duration
+}
+
+// NewBasicMetricLister creates a MetricLister that is capable of interactly directly with Prometheus to list metrics.
+func NewBasicMetricLister(promClient prom.Client, namers []naming.MetricNamer, lookback time.Duration) MetricLister {
+	lister := basicMetricLister{
+		promClient: promClient,
+		namers:     namers,
+		lookback:   lookback,
+	}
+
+	return &lister
+}
+
+type selectorSeries struct {
+	selector prom.Selector
+	series   []prom.Series
+}
+
+func (l *basicMetricLister) ListAllMetrics() (MetricUpdateResult, error) {
+	result := MetricUpdateResult{
+		series: make([][]prom.Series, 0),
+		namers: make([]naming.MetricNamer, 0),
+	}
+
+	startTime := pmodel.Now().Add(-1 * l.lookback)
+
+	// these can take a while on large clusters, so launch in parallel
+	// and don't duplicate
+	selectors := make(map[prom.Selector]struct{})
+	selectorSeriesChan := make(chan selectorSeries, len(l.namers))
+	errs := make(chan error, len(l.namers))
+	for _, converter := range l.namers {
+		sel := converter.Selector()
+		if _, ok := selectors[sel]; ok {
+			errs <- nil
+			selectorSeriesChan <- selectorSeries{}
+			continue
+		}
+		selectors[sel] = struct{}{}
+		go func() {
+			series, err := l.promClient.Series(context.TODO(), pmodel.Interval{Start: startTime, End: 0}, sel)
+			if err != nil {
+				errs <- fmt.Errorf("unable to fetch metrics for query %q: %v", sel, err)
+				return
+			}
+			errs <- nil
+			// Push into the channel: "this selector produced these series"
+			selectorSeriesChan <- selectorSeries{
+				selector: sel,
+				series:   series,
+			}
+		}()
+	}
+
+	// don't do duplicate queries when it's just the matchers that change
+	seriesCacheByQuery := make(map[prom.Selector][]prom.Series)
+
+	// iterate through, blocking until we've got all results
+	// We know that, from above, we should have pushed one item into the channel
+	// for each converter. So here, we'll assume that we should receive one item per converter.
+	for range l.namers {
+		if err := <-errs; err != nil {
+			return result, fmt.Errorf("unable to update list of all metrics: %v", err)
+		}
+		// Receive from the channel: "this selector produced these series"
+		// We stuff that into this map so that we can collect the data as it arrives
+		// and then, once we've received it all, we can process it below.
+		if ss := <-selectorSeriesChan; ss.series != nil {
+			seriesCacheByQuery[ss.selector] = ss.series
+		}
+	}
+	close(errs)
+
+	// Now that we've collected all of the results into `seriesCacheByQuery`
+	// we can start processing them.
+	newSeries := make([][]prom.Series, len(l.namers))
+	for i, namer := range l.namers {
+		series, cached := seriesCacheByQuery[namer.Selector()]
+		if !cached {
+			return result, fmt.Errorf("unable to update list of all metrics: no metrics retrieved for query %q", namer.Selector())
+		}
+		// Because converters provide a "post-filtering" option, it's not enough to
+		// simply take all the series that were produced. We need to further filter them.
+		newSeries[i] = namer.FilterSeries(series)
+	}
+
+	klog.V(10).Infof("Set available metric list from Prometheus to: %v", newSeries)
+
+	result.series = newSeries
+	result.namers = l.namers
+	return result, nil
+}
+
+// MetricUpdateResult represents the output of a periodic inspection of metrics found to be
+// available in Prometheus.
+// It includes both the series data the Prometheus exposed, as well as the configurational
+// object that led to their discovery.
+type MetricUpdateResult struct {
+	series [][]prom.Series
+	namers []naming.MetricNamer
+}
+
+// MetricUpdateCallback is a function signature for receiving periodic updates about
+// available metrics.
+type MetricUpdateCallback func(MetricUpdateResult)

pkg/external-provider/external_series_registry.go

@@ -0,0 +1,128 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"sync"
+
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/klog/v2"
+
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
+)
+
+// ExternalSeriesRegistry acts as the top-level converter for transforming Kubernetes requests
+// for external metrics into Prometheus queries.
+type ExternalSeriesRegistry interface {
+	// ListAllMetrics lists all metrics known to this registry
+	ListAllMetrics() []provider.ExternalMetricInfo
+	QueryForMetric(namespace string, metricName string, metricSelector labels.Selector) (prom.Selector, bool, error)
+}
+
+// overridableSeriesRegistry is a basic SeriesRegistry
+type externalSeriesRegistry struct {
+	// We lock when reading/writing metrics, and metricsInfo to prevent inconsistencies.
+	mu sync.RWMutex
+
+	// metrics is the list of all known metrics, ready to return from the API
+	metrics []provider.ExternalMetricInfo
+	// metricsInfo is a lookup from a metric to SeriesConverter for the sake of generating queries
+	metricsInfo map[string]seriesInfo
+}
+
+type seriesInfo struct {
+	// seriesName is the name of the corresponding Prometheus series
+	seriesName string
+
+	// namer is the MetricNamer used to name this series
+	namer naming.MetricNamer
+}
+
+// NewExternalSeriesRegistry creates an ExternalSeriesRegistry driven by the data from the provided MetricLister.
+func NewExternalSeriesRegistry(lister MetricListerWithNotification) ExternalSeriesRegistry {
+	var registry = externalSeriesRegistry{
+		metrics:     make([]provider.ExternalMetricInfo, 0),
+		metricsInfo: map[string]seriesInfo{},
+	}
+
+	lister.AddNotificationReceiver(registry.filterAndStoreMetrics)
+
+	return &registry
+}
+
+func (r *externalSeriesRegistry) filterAndStoreMetrics(result MetricUpdateResult) {
+	newSeriesSlices := result.series
+	namers := result.namers
+
+	if len(newSeriesSlices) != len(namers) {
+		klog.Fatal("need one set of series per converter")
+	}
+	apiMetricsCache := make([]provider.ExternalMetricInfo, 0)
+	rawMetricsCache := make(map[string]seriesInfo)
+
+	for i, newSeries := range newSeriesSlices {
+		namer := namers[i]
+		for _, series := range newSeries {
+			identity, err := namer.MetricNameForSeries(series)
+
+			if err != nil {
+				klog.Errorf("unable to name series %q, skipping: %v", series.String(), err)
+				continue
+			}
+
+			name := identity
+			rawMetricsCache[name] = seriesInfo{
+				seriesName: series.Name,
+				namer:      namer,
+			}
+		}
+	}
+
+	for metricName := range rawMetricsCache {
+		apiMetricsCache = append(apiMetricsCache, provider.ExternalMetricInfo{
+			Metric: metricName,
+		})
+	}
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	r.metrics = apiMetricsCache
+	r.metricsInfo = rawMetricsCache
+}
+
+func (r *externalSeriesRegistry) ListAllMetrics() []provider.ExternalMetricInfo {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	return r.metrics
+}
+
+func (r *externalSeriesRegistry) QueryForMetric(namespace string, metricName string, metricSelector labels.Selector) (prom.Selector, bool, error) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	info, found := r.metricsInfo[metricName]
+
+	if !found {
+		klog.V(10).Infof("external metric %q not found", metricName)
+		return "", false, nil
+	}
+	query, err := info.namer.QueryForExternalSeries(info.seriesName, namespace, metricSelector)
+
+	return query, found, err
+}

pkg/external-provider/metric_converter.go

@@ -0,0 +1,143 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/prometheus/common/model"
+
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/metrics/pkg/apis/external_metrics"
+
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+)
+
+// MetricConverter provides a unified interface for converting the results of
+// Prometheus queries into external metric types.
+type MetricConverter interface {
+	Convert(info provider.ExternalMetricInfo, queryResult prom.QueryResult) (*external_metrics.ExternalMetricValueList, error)
+}
+
+type metricConverter struct {
+}
+
+// NewMetricConverter creates a MetricCoverter, capable of converting any of the three metric types
+// returned by the Prometheus client into external metrics types.
+func NewMetricConverter() MetricConverter {
+	return &metricConverter{}
+}
+
+func (c *metricConverter) Convert(info provider.ExternalMetricInfo, queryResult prom.QueryResult) (*external_metrics.ExternalMetricValueList, error) {
+	if queryResult.Type == model.ValScalar {
+		return c.convertScalar(info, queryResult)
+	}
+
+	if queryResult.Type == model.ValVector {
+		return c.convertVector(info, queryResult)
+	}
+
+	return nil, errors.New("encountered an unexpected query result type")
+}
+
+func (c *metricConverter) convertSample(info provider.ExternalMetricInfo, sample *model.Sample) (*external_metrics.ExternalMetricValue, error) {
+	labels := c.convertLabels(sample.Metric)
+
+	singleMetric := external_metrics.ExternalMetricValue{
+		MetricName: info.Metric,
+		Timestamp: metav1.Time{
+			Time: sample.Timestamp.Time(),
+		},
+		Value:        *resource.NewMilliQuantity(int64(sample.Value*1000.0), resource.DecimalSI),
+		MetricLabels: labels,
+	}
+
+	return &singleMetric, nil
+}
+
+func (c *metricConverter) convertLabels(inLabels model.Metric) map[string]string {
+	numLabels := len(inLabels)
+	outLabels := make(map[string]string, numLabels)
+	for labelName, labelVal := range inLabels {
+		outLabels[string(labelName)] = string(labelVal)
+	}
+
+	return outLabels
+}
+
+func (c *metricConverter) convertVector(info provider.ExternalMetricInfo, queryResult prom.QueryResult) (*external_metrics.ExternalMetricValueList, error) {
+	if queryResult.Type != model.ValVector {
+		return nil, errors.New("incorrect query result type")
+	}
+
+	toConvert := *queryResult.Vector
+
+	if toConvert == nil {
+		return nil, errors.New("the provided input did not contain vector query results")
+	}
+
+	items := []external_metrics.ExternalMetricValue{}
+	metricValueList := external_metrics.ExternalMetricValueList{
+		Items: items,
+	}
+
+	numSamples := toConvert.Len()
+	if numSamples == 0 {
+		return &metricValueList, nil
+	}
+
+	for _, val := range toConvert {
+		singleMetric, err := c.convertSample(info, val)
+
+		if err != nil {
+			return nil, fmt.Errorf("unable to convert vector: %v", err)
+		}
+
+		items = append(items, *singleMetric)
+	}
+
+	metricValueList = external_metrics.ExternalMetricValueList{
+		Items: items,
+	}
+	return &metricValueList, nil
+}
+
+func (c *metricConverter) convertScalar(info provider.ExternalMetricInfo, queryResult prom.QueryResult) (*external_metrics.ExternalMetricValueList, error) {
+	if queryResult.Type != model.ValScalar {
+		return nil, errors.New("scalarConverter can only convert scalar query results")
+	}
+
+	toConvert := queryResult.Scalar
+
+	if toConvert == nil {
+		return nil, errors.New("the provided input did not contain scalar query results")
+	}
+
+	result := external_metrics.ExternalMetricValueList{
+		Items: []external_metrics.ExternalMetricValue{
+			{
+				MetricName: info.Metric,
+				Timestamp: metav1.Time{
+					Time: toConvert.Timestamp.Time(),
+				},
+				Value: *resource.NewMilliQuantity(int64(toConvert.Value*1000.0), resource.DecimalSI),
+			},
+		},
+	}
+	return &result, nil
+}

pkg/external-provider/periodic_metric_lister.go

@@ -0,0 +1,91 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"time"
+
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/apimachinery/pkg/util/wait"
+)
+
+type periodicMetricLister struct {
+	realLister       MetricLister
+	updateInterval   time.Duration
+	mostRecentResult MetricUpdateResult
+	callbacks        []MetricUpdateCallback
+}
+
+// NewPeriodicMetricLister creates a MetricLister that periodically pulls the list of available metrics
+// at the provided interval, but defers the actual act of retrieving the metrics to the supplied MetricLister.
+func NewPeriodicMetricLister(realLister MetricLister, updateInterval time.Duration) (MetricListerWithNotification, Runnable) {
+	lister := periodicMetricLister{
+		updateInterval: updateInterval,
+		realLister:     realLister,
+		callbacks:      make([]MetricUpdateCallback, 0),
+	}
+
+	return &lister, &lister
+}
+
+func (l *periodicMetricLister) AddNotificationReceiver(callback MetricUpdateCallback) {
+	l.callbacks = append(l.callbacks, callback)
+}
+
+func (l *periodicMetricLister) ListAllMetrics() (MetricUpdateResult, error) {
+	return l.mostRecentResult, nil
+}
+
+func (l *periodicMetricLister) Run() {
+	l.RunUntil(wait.NeverStop)
+}
+
+func (l *periodicMetricLister) RunUntil(stopChan <-chan struct{}) {
+	go wait.Until(func() {
+		if err := l.updateMetrics(); err != nil {
+			utilruntime.HandleError(err)
+		}
+	}, l.updateInterval, stopChan)
+}
+
+func (l *periodicMetricLister) updateMetrics() error {
+	result, err := l.realLister.ListAllMetrics()
+
+	if err != nil {
+		return err
+	}
+
+	// Cache the result.
+	l.mostRecentResult = result
+	// Let our listeners know we've got new data ready for them.
+	l.notifyListeners()
+	return nil
+}
+
+func (l *periodicMetricLister) notifyListeners() {
+	for _, listener := range l.callbacks {
+		if listener != nil {
+			listener(l.mostRecentResult)
+		}
+	}
+}
+
+func (l *periodicMetricLister) UpdateNow() {
+	if err := l.updateMetrics(); err != nil {
+		utilruntime.HandleError(err)
+	}
+}

pkg/external-provider/periodic_metric_lister_test.go

@@ -0,0 +1,83 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"testing"
+	"time"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+
+	"github.com/stretchr/testify/require"
+)
+
+type fakeLister struct {
+	callCount int
+}
+
+func (f *fakeLister) ListAllMetrics() (MetricUpdateResult, error) {
+	f.callCount++
+
+	return MetricUpdateResult{
+		series: [][]prom.Series{
+			{
+				{
+					Name: "a_series",
+				},
+			},
+		},
+	}, nil
+}
+
+func TestWhenNewMetricsAvailableCallbackIsInvoked(t *testing.T) {
+	fakeLister := &fakeLister{}
+	targetLister, _ := NewPeriodicMetricLister(fakeLister, time.Duration(1000))
+	periodicLister := targetLister.(*periodicMetricLister)
+
+	callbackInvoked := false
+	callback := func(r MetricUpdateResult) {
+		callbackInvoked = true
+	}
+
+	periodicLister.AddNotificationReceiver(callback)
+	err := periodicLister.updateMetrics()
+	require.NoError(t, err)
+	require.True(t, callbackInvoked)
+}
+
+func TestWhenListingMetricsReturnsCachedValues(t *testing.T) {
+	fakeLister := &fakeLister{}
+	targetLister, _ := NewPeriodicMetricLister(fakeLister, time.Duration(1000))
+	periodicLister := targetLister.(*periodicMetricLister)
+
+	// We haven't invoked the inner lister yet, so we should have no results.
+	resultBeforeUpdate, err := periodicLister.ListAllMetrics()
+	require.NoError(t, err)
+	require.Equal(t, 0, len(resultBeforeUpdate.series))
+	require.Equal(t, 0, fakeLister.callCount)
+
+	// We can simulate waiting for the udpate interval to pass...
+	// which should result in calling the inner lister to get the metrics.
+	err = periodicLister.updateMetrics()
+	require.NoError(t, err)
+	require.Equal(t, 1, fakeLister.callCount)
+
+	// If we list now, we should return the cached values.
+	// Make sure we got some results this time
+	// as well as that we didn't unnecessarily invoke the inner lister.
+	resultAfterUpdate, err := periodicLister.ListAllMetrics()
+	require.NoError(t, err)
+	require.NotEqual(t, 0, len(resultAfterUpdate.series))
+	require.Equal(t, 1, fakeLister.callCount)
+}

pkg/external-provider/provider.go

@@ -0,0 +1,90 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package provider
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	pmodel "github.com/prometheus/common/model"
+
+	apierr "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/klog/v2"
+	"k8s.io/metrics/pkg/apis/external_metrics"
+
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
+)
+
+type externalPrometheusProvider struct {
+	promClient      prom.Client
+	metricConverter MetricConverter
+
+	seriesRegistry ExternalSeriesRegistry
+}
+
+func (p *externalPrometheusProvider) GetExternalMetric(ctx context.Context, namespace string, metricSelector labels.Selector, info provider.ExternalMetricInfo) (*external_metrics.ExternalMetricValueList, error) {
+	selector, found, err := p.seriesRegistry.QueryForMetric(namespace, info.Metric, metricSelector)
+
+	if err != nil {
+		klog.Errorf("unable to generate a query for the metric: %v", err)
+		return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
+	}
+
+	if !found {
+		return nil, provider.NewMetricNotFoundError(p.selectGroupResource(namespace), info.Metric)
+	}
+	// Here is where we're making the query, need to be before here xD
+	queryResults, err := p.promClient.Query(ctx, pmodel.Now(), selector)
+
+	if err != nil {
+		klog.Errorf("unable to fetch metrics from prometheus: %v", err)
+		// don't leak implementation details to the user
+		return nil, apierr.NewInternalError(fmt.Errorf("unable to fetch metrics"))
+	}
+	return p.metricConverter.Convert(info, queryResults)
+}
+
+func (p *externalPrometheusProvider) ListAllExternalMetrics() []provider.ExternalMetricInfo {
+	return p.seriesRegistry.ListAllMetrics()
+}
+
+func (p *externalPrometheusProvider) selectGroupResource(namespace string) schema.GroupResource {
+	if namespace == "default" {
+		return naming.NsGroupResource
+	}
+
+	return schema.GroupResource{
+		Group:    "",
+		Resource: "",
+	}
+}
+
+// NewExternalPrometheusProvider creates an ExternalMetricsProvider capable of responding to Kubernetes requests for external metric data
+func NewExternalPrometheusProvider(promClient prom.Client, namers []naming.MetricNamer, updateInterval time.Duration, maxAge time.Duration) (provider.ExternalMetricsProvider, Runnable) {
+	metricConverter := NewMetricConverter()
+	basicLister := NewBasicMetricLister(promClient, namers, maxAge)
+	periodicLister, _ := NewPeriodicMetricLister(basicLister, updateInterval)
+	seriesRegistry := NewExternalSeriesRegistry(periodicLister)
+	return &externalPrometheusProvider{
+		promClient:      promClient,
+		seriesRegistry:  seriesRegistry,
+		metricConverter: metricConverter,
+	}, periodicLister
+}

pkg/naming/errors.go

@@ -0,0 +1,34 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package naming
+
+import "errors"
+
+var (
+	// ErrUnsupportedOperator creates an error that represents the fact that we were requested to service a query that
+	// Prometheus would be unable to support.
+	ErrUnsupportedOperator = errors.New("operator not supported by prometheus")
+
+	// ErrMalformedQuery creates an error that represents the fact that we were requested to service a query
+	// that was malformed in its operator/value combination.
+	ErrMalformedQuery = errors.New("operator requires values")
+
+	// ErrQueryUnsupportedValues creates an error that represents an unsupported return value from the
+	// specified query.
+	ErrQueryUnsupportedValues = errors.New("operator does not support values")
+
+	// ErrLabelNotSpecified creates an error that represents the fact that we were requested to service a query
+	// that was malformed in its label specification.
+	ErrLabelNotSpecified = errors.New("label not specified")
+)

pkg/naming/lbl_res.go

@@ -0,0 +1,100 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package naming
+
+import (
+	"bytes"
+	"fmt"
+	"regexp"
+	"text/template"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	pmodel "github.com/prometheus/common/model"
+)
+
+// labelGroupResExtractor extracts schema.GroupResources from series labels.
+type labelGroupResExtractor struct {
+	regex *regexp.Regexp
+
+	resourceInd int
+	groupInd    *int
+}
+
+// newLabelGroupResExtractor creates a new labelGroupResExtractor for labels whose form
+// matches the given template.  It does so by creating a regular expression from the template,
+// so anything in the template which limits resource or group name length will cause issues.
+func newLabelGroupResExtractor(labelTemplate *template.Template) (*labelGroupResExtractor, error) {
+	labelRegexBuff := new(bytes.Buffer)
+	if err := labelTemplate.Execute(labelRegexBuff, schema.GroupResource{
+		Group:    "(?P<group>.+?)",
+		Resource: "(?P<resource>.+?)"},
+	); err != nil {
+		return nil, fmt.Errorf("unable to convert label template to matcher: %v", err)
+	}
+	if labelRegexBuff.Len() == 0 {
+		return nil, fmt.Errorf("unable to convert label template to matcher: empty template")
+	}
+	labelRegexRaw := "^" + labelRegexBuff.String() + "$"
+	labelRegex, err := regexp.Compile(labelRegexRaw)
+	if err != nil {
+		return nil, fmt.Errorf("unable to convert label template to matcher: %v", err)
+	}
+
+	var groupInd *int
+	var resInd *int
+
+	for i, name := range labelRegex.SubexpNames() {
+		switch name {
+		case "group":
+			ind := i // copy to avoid iteration variable reference
+			groupInd = &ind
+		case "resource":
+			ind := i // copy to avoid iteration variable reference
+			resInd = &ind
+		}
+	}
+
+	if resInd == nil {
+		return nil, fmt.Errorf("must include at least `{{.Resource}}` in the label template")
+	}
+
+	return &labelGroupResExtractor{
+		regex:       labelRegex,
+		resourceInd: *resInd,
+		groupInd:    groupInd,
+	}, nil
+}
+
+// GroupResourceForLabel extracts a schema.GroupResource from the given label, if possible.
+// The second return value indicates whether or not a potential group-resource was found in this label.
+func (e *labelGroupResExtractor) GroupResourceForLabel(lbl pmodel.LabelName) (schema.GroupResource, bool) {
+	matchGroups := e.regex.FindStringSubmatch(string(lbl))
+	if matchGroups != nil {
+		group := ""
+		if e.groupInd != nil {
+			group = matchGroups[*e.groupInd]
+		}
+
+		return schema.GroupResource{
+			Group:    group,
+			Resource: matchGroups[e.resourceInd],
+		}, true
+	}
+
+	return schema.GroupResource{}, false
+}

pkg/naming/metric_namer.go

@@ -0,0 +1,222 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package naming
+
+import (
+	"fmt"
+	"regexp"
+
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/config"
+)
+
+// MetricNamer knows how to convert Prometheus series names and label names to
+// metrics API resources, and vice-versa.  MetricNamers should be safe to access
+// concurrently.  Returned group-resources are "normalized" as per the
+// MetricInfo#Normalized method.  Group-resources passed as arguments must
+// themselves be normalized.
+type MetricNamer interface {
+	// Selector produces the appropriate Prometheus series selector to match all
+	// series handable by this namer.
+	Selector() prom.Selector
+	// FilterSeries checks to see which of the given series match any additional
+	// constraints beyond the series query.  It's assumed that the series given
+	// already match the series query.
+	FilterSeries(series []prom.Series) []prom.Series
+	// MetricNameForSeries returns the name (as presented in the API) for a given series.
+	MetricNameForSeries(series prom.Series) (string, error)
+	// QueryForSeries returns the query for a given series (not API metric name), with
+	// the given namespace name (if relevant), resource, and resource names.
+	QueryForSeries(series string, resource schema.GroupResource, namespace string, metricSelector labels.Selector, names ...string) (prom.Selector, error)
+	// QueryForExternalSeries returns the query for a given series (not API metric name), with
+	// the given namespace name (if relevant), resource, and resource names.
+	QueryForExternalSeries(series string, namespace string, targetLabels labels.Selector) (prom.Selector, error)
+
+	ResourceConverter
+}
+
+func (n *metricNamer) Selector() prom.Selector {
+	return n.seriesQuery
+}
+
+// ReMatcher either positively or negatively matches a regex
+type ReMatcher struct {
+	regex    *regexp.Regexp
+	positive bool
+}
+
+func NewReMatcher(cfg config.RegexFilter) (*ReMatcher, error) {
+	if cfg.Is != "" && cfg.IsNot != "" {
+		return nil, fmt.Errorf("cannot have both an `is` (%q) and `isNot` (%q) expression in a single filter", cfg.Is, cfg.IsNot)
+	}
+	if cfg.Is == "" && cfg.IsNot == "" {
+		return nil, fmt.Errorf("must have either an `is` or `isNot` expression in a filter")
+	}
+
+	var positive bool
+	var regexRaw string
+	if cfg.Is != "" {
+		positive = true
+		regexRaw = cfg.Is
+	} else {
+		positive = false
+		regexRaw = cfg.IsNot
+	}
+
+	regex, err := regexp.Compile(regexRaw)
+	if err != nil {
+		return nil, fmt.Errorf("unable to compile series filter %q: %v", regexRaw, err)
+	}
+
+	return &ReMatcher{
+		regex:    regex,
+		positive: positive,
+	}, nil
+}
+
+func (m *ReMatcher) Matches(val string) bool {
+	return m.regex.MatchString(val) == m.positive
+}
+
+type metricNamer struct {
+	seriesQuery    prom.Selector
+	metricsQuery   MetricsQuery
+	nameMatches    *regexp.Regexp
+	nameAs         string
+	seriesMatchers []*ReMatcher
+
+	ResourceConverter
+}
+
+// queryTemplateArgs are the arguments for the metrics query template.
+func (n *metricNamer) FilterSeries(initialSeries []prom.Series) []prom.Series {
+	if len(n.seriesMatchers) == 0 {
+		return initialSeries
+	}
+
+	finalSeries := make([]prom.Series, 0, len(initialSeries))
+SeriesLoop:
+	for _, series := range initialSeries {
+		for _, matcher := range n.seriesMatchers {
+			if !matcher.Matches(series.Name) {
+				continue SeriesLoop
+			}
+		}
+		finalSeries = append(finalSeries, series)
+	}
+
+	return finalSeries
+}
+
+func (n *metricNamer) QueryForSeries(series string, resource schema.GroupResource, namespace string, metricSelector labels.Selector, names ...string) (prom.Selector, error) {
+	return n.metricsQuery.Build(series, resource, namespace, nil, metricSelector, names...)
+}
+
+func (n *metricNamer) QueryForExternalSeries(series string, namespace string, metricSelector labels.Selector) (prom.Selector, error) {
+	return n.metricsQuery.BuildExternal(series, namespace, "", []string{}, metricSelector)
+}
+
+func (n *metricNamer) MetricNameForSeries(series prom.Series) (string, error) {
+	matches := n.nameMatches.FindStringSubmatchIndex(series.Name)
+	if matches == nil {
+		return "", fmt.Errorf("series name %q did not match expected pattern %q", series.Name, n.nameMatches.String())
+	}
+	outNameBytes := n.nameMatches.ExpandString(nil, n.nameAs, series.Name, matches)
+	return string(outNameBytes), nil
+}
+
+// NamersFromConfig produces a MetricNamer for each rule in the given config.
+func NamersFromConfig(cfg []config.DiscoveryRule, mapper apimeta.RESTMapper) ([]MetricNamer, error) {
+	namers := make([]MetricNamer, len(cfg))
+
+	for i, rule := range cfg {
+		resConv, err := NewResourceConverter(rule.Resources.Template, rule.Resources.Overrides, mapper)
+		if err != nil {
+			return nil, err
+		}
+
+		// queries are namespaced by default unless the rule specifically disables it
+		namespaced := true
+		if rule.Resources.Namespaced != nil {
+			namespaced = *rule.Resources.Namespaced
+		}
+
+		metricsQuery, err := NewExternalMetricsQuery(rule.MetricsQuery, resConv, namespaced)
+		if err != nil {
+			return nil, fmt.Errorf("unable to construct metrics query associated with series query %q: %v", rule.SeriesQuery, err)
+		}
+
+		seriesMatchers := make([]*ReMatcher, len(rule.SeriesFilters))
+		for i, filterRaw := range rule.SeriesFilters {
+			matcher, err := NewReMatcher(filterRaw)
+			if err != nil {
+				return nil, fmt.Errorf("unable to generate series name filter associated with series query %q: %v", rule.SeriesQuery, err)
+			}
+			seriesMatchers[i] = matcher
+		}
+		if rule.Name.Matches != "" {
+			matcher, err := NewReMatcher(config.RegexFilter{Is: rule.Name.Matches})
+			if err != nil {
+				return nil, fmt.Errorf("unable to generate series name filter from name rules associated with series query %q: %v", rule.SeriesQuery, err)
+			}
+			seriesMatchers = append(seriesMatchers, matcher)
+		}
+
+		var nameMatches *regexp.Regexp
+		if rule.Name.Matches != "" {
+			nameMatches, err = regexp.Compile(rule.Name.Matches)
+			if err != nil {
+				return nil, fmt.Errorf("unable to compile series name match expression %q associated with series query %q: %v", rule.Name.Matches, rule.SeriesQuery, err)
+			}
+		} else {
+			// this will always succeed
+			nameMatches = regexp.MustCompile(".*")
+		}
+		nameAs := rule.Name.As
+		if nameAs == "" {
+			// check if we have an obvious default
+			subexpNames := nameMatches.SubexpNames()
+			switch len(subexpNames) {
+			case 1:
+				// no capture groups, use the whole thing
+				nameAs = "$0"
+			case 2:
+				// one capture group, use that
+				nameAs = "$1"
+			default:
+				return nil, fmt.Errorf("must specify an 'as' value for name matcher %q associated with series query %q", rule.Name.Matches, rule.SeriesQuery)
+			}
+		}
+
+		namer := &metricNamer{
+			seriesQuery:       prom.Selector(rule.SeriesQuery),
+			metricsQuery:      metricsQuery,
+			nameMatches:       nameMatches,
+			nameAs:            nameAs,
+			seriesMatchers:    seriesMatchers,
+			ResourceConverter: resConv,
+		}
+
+		namers[i] = namer
+	}
+
+	return namers, nil
+}

pkg/naming/metrics_query.go

@@ -0,0 +1,369 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package naming
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"strings"
+	"text/template"
+
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/selection"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+)
+
+// MetricsQuery represents a compiled metrics query for some set of
+// series that can be converted into an series of Prometheus expressions to
+// be passed to a client.
+type MetricsQuery interface {
+	// Build constructs Prometheus expressions to represent this query
+	// over the given group-resource.  If namespace is empty, the resource
+	// is considered to be root-scoped.  extraGroupBy may be used for cases
+	// where we need to scope down more specifically than just the group-resource
+	// (e.g. container metrics).
+	Build(series string, groupRes schema.GroupResource, namespace string, extraGroupBy []string, metricSelector labels.Selector, resourceNames ...string) (prom.Selector, error)
+	BuildExternal(seriesName string, namespace string, groupBy string, groupBySlice []string, metricSelector labels.Selector) (prom.Selector, error)
+}
+
+// NewMetricsQuery constructs a new MetricsQuery by compiling the given Go template.
+// The delimiters on the template are `<<` and `>>`, and it may use the following fields:
+// - Series: the series in question
+// - LabelMatchers: a pre-stringified form of the label matchers for the resources in the query
+// - LabelMatchersByName: the raw map-form of the above matchers
+// - GroupBy: the group-by clause to use for the resources in the query (stringified)
+// - GroupBySlice: the raw slice form of the above group-by clause
+func NewMetricsQuery(queryTemplate string, resourceConverter ResourceConverter) (MetricsQuery, error) {
+	templ, err := template.New("metrics-query").Delims("<<", ">>").Parse(queryTemplate)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse metrics query template %q: %v", queryTemplate, err)
+	}
+
+	return &metricsQuery{
+		resConverter: resourceConverter,
+		template:     templ,
+		namespaced:   true,
+	}, nil
+}
+
+// NewExternalMetricsQuery constructs a new MetricsQuery by compiling the given Go template.
+// The delimiters on the template are `<<` and `>>`, and it may use the following fields:
+// - Series: the series in question
+// - LabelMatchers: a pre-stringified form of the label matchers for the resources in the query
+// - LabelMatchersByName: the raw map-form of the above matchers
+// - GroupBy: the group-by clause to use for the resources in the query (stringified)
+// - GroupBySlice: the raw slice form of the above group-by clause
+func NewExternalMetricsQuery(queryTemplate string, resourceConverter ResourceConverter, namespaced bool) (MetricsQuery, error) {
+	templ, err := template.New("metrics-query").Delims("<<", ">>").Parse(queryTemplate)
+	if err != nil {
+		return nil, fmt.Errorf("unable to parse metrics query template %q: %v", queryTemplate, err)
+	}
+
+	return &metricsQuery{
+		resConverter: resourceConverter,
+		template:     templ,
+		namespaced:   namespaced,
+	}, nil
+}
+
+// metricsQuery is a MetricsQuery based on a compiled Go text template.
+// with the delimiters as `<<` and `>>`, and the arguments found in
+// queryTemplateArgs.
+type metricsQuery struct {
+	resConverter ResourceConverter
+	template     *template.Template
+	namespaced   bool
+}
+
+// queryTemplateArgs contains the arguments for the template used in metricsQuery.
+type queryTemplateArgs struct {
+	Series            string
+	LabelMatchers     string
+	LabelValuesByName map[string]string
+	GroupBy           string
+	GroupBySlice      []string
+}
+
+type queryPart struct {
+	labelName string
+	values    []string
+	operator  selection.Operator
+}
+
+func (q *metricsQuery) Build(series string, resource schema.GroupResource, namespace string, extraGroupBy []string, metricSelector labels.Selector, names ...string) (prom.Selector, error) {
+	queryParts := q.createQueryPartsFromSelector(metricSelector)
+
+	if namespace != "" {
+		namespaceLbl, err := q.resConverter.LabelForResource(NsGroupResource)
+		if err != nil {
+			return "", err
+		}
+
+		queryParts = append(queryParts, queryPart{
+			labelName: string(namespaceLbl),
+			values:    []string{namespace},
+			operator:  selection.Equals,
+		})
+	}
+
+	exprs, valuesByName, err := q.processQueryParts(queryParts)
+	if err != nil {
+		return "", err
+	}
+
+	resourceLbl, err := q.resConverter.LabelForResource(resource)
+	if err != nil {
+		return "", err
+	}
+
+	matcher := prom.LabelEq
+	targetValue := strings.Join(names, "|")
+
+	if len(names) > 1 {
+		matcher = prom.LabelMatches
+	}
+
+	exprs = append(exprs, matcher(string(resourceLbl), targetValue))
+	valuesByName[string(resourceLbl)] = targetValue
+
+	groupBy := make([]string, 0, len(extraGroupBy)+1)
+	groupBy = append(groupBy, string(resourceLbl))
+	groupBy = append(groupBy, extraGroupBy...)
+
+	args := queryTemplateArgs{
+		Series:            series,
+		LabelMatchers:     strings.Join(exprs, ","),
+		LabelValuesByName: valuesByName,
+		GroupBy:           strings.Join(groupBy, ","),
+		GroupBySlice:      groupBy,
+	}
+	queryBuff := new(bytes.Buffer)
+	if err := q.template.Execute(queryBuff, args); err != nil {
+		return "", err
+	}
+
+	if queryBuff.Len() == 0 {
+		return "", fmt.Errorf("empty query produced by metrics query template")
+	}
+
+	return prom.Selector(queryBuff.String()), nil
+}
+
+func (q *metricsQuery) BuildExternal(seriesName string, namespace string, groupBy string, groupBySlice []string, metricSelector labels.Selector) (prom.Selector, error) {
+	queryParts := []queryPart{}
+
+	// Build up the query parts from the selector.
+	queryParts = append(queryParts, q.createQueryPartsFromSelector(metricSelector)...)
+
+	if q.namespaced && namespace != "" {
+		namespaceLbl, err := q.resConverter.LabelForResource(NsGroupResource)
+		if err != nil {
+			return "", err
+		}
+
+		queryParts = append(queryParts, queryPart{
+			labelName: string(namespaceLbl),
+			values:    []string{namespace},
+			operator:  selection.Equals,
+		})
+	}
+
+	// Convert our query parts into the types we need for our template.
+	exprs, valuesByName, err := q.processQueryParts(queryParts)
+
+	if err != nil {
+		return "", err
+	}
+
+	args := queryTemplateArgs{
+		Series:            seriesName,
+		LabelMatchers:     strings.Join(exprs, ","),
+		LabelValuesByName: valuesByName,
+		GroupBy:           groupBy,
+		GroupBySlice:      groupBySlice,
+	}
+
+	queryBuff := new(bytes.Buffer)
+	if err := q.template.Execute(queryBuff, args); err != nil {
+		return "", err
+	}
+
+	if queryBuff.Len() == 0 {
+		return "", fmt.Errorf("empty query produced by metrics query template")
+	}
+
+	return prom.Selector(queryBuff.String()), nil
+}
+
+func (q *metricsQuery) createQueryPartsFromSelector(metricSelector labels.Selector) []queryPart {
+	requirements, _ := metricSelector.Requirements()
+
+	selectors := []queryPart{}
+	for i := 0; i < len(requirements); i++ {
+		selector := q.convertRequirement(requirements[i])
+
+		selectors = append(selectors, selector)
+	}
+
+	return selectors
+}
+
+func (q *metricsQuery) convertRequirement(requirement labels.Requirement) queryPart {
+	labelName := requirement.Key()
+	values := requirement.Values().List()
+
+	return queryPart{
+		labelName: labelName,
+		values:    values,
+		operator:  requirement.Operator(),
+	}
+}
+
+func (q *metricsQuery) processQueryParts(queryParts []queryPart) ([]string, map[string]string, error) {
+	// We've take the approach here that if we can't perfectly map their query into a Prometheus
+	// query that we should abandon the effort completely.
+	// The concern is that if we don't get a perfect match on their query parameters, the query result
+	// might contain unexpected data that would cause them to take an erroneous action based on the result.
+
+	// Contains the expressions that we want to include as part of the query to Prometheus.
+	// e.g. "namespace=my-namespace"
+	// e.g. "some_label=some-value"
+	var exprs []string
+
+	// Contains the list of label values we're targeting, by namespace.
+	// e.g. "some_label" => "value-one|value-two"
+	valuesByName := map[string]string{}
+
+	// Convert our query parts into template arguments.
+	for _, qPart := range queryParts {
+		// Be resilient against bad inputs.
+		// We obviously can't generate label filters for these cases.
+		if qPart.labelName == "" {
+			return nil, nil, ErrLabelNotSpecified
+		}
+
+		if !q.operatorIsSupported(qPart.operator) {
+			return nil, nil, ErrUnsupportedOperator
+		}
+
+		matcher, err := q.selectMatcher(qPart.operator, qPart.values)
+
+		if err != nil {
+			return nil, nil, err
+		}
+
+		targetValue, err := q.selectTargetValue(qPart.operator, qPart.values)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		expression := matcher(qPart.labelName, targetValue)
+		exprs = append(exprs, expression)
+		valuesByName[qPart.labelName] = strings.Join(qPart.values, "|")
+	}
+
+	return exprs, valuesByName, nil
+}
+
+func (q *metricsQuery) selectMatcher(operator selection.Operator, values []string) (func(string, string) string, error) {
+	switch len(values) {
+	case 0:
+		switch operator {
+		case selection.Exists:
+			return prom.LabelNeq, nil
+		case selection.DoesNotExist:
+			return prom.LabelEq, nil
+		case selection.Equals, selection.DoubleEquals, selection.NotEquals, selection.In, selection.NotIn:
+			return nil, ErrMalformedQuery
+		}
+	case 1:
+		switch operator {
+		case selection.Equals, selection.DoubleEquals:
+			return prom.LabelEq, nil
+		case selection.NotEquals:
+			return prom.LabelNeq, nil
+		case selection.In, selection.Exists:
+			return prom.LabelMatches, nil
+		case selection.DoesNotExist, selection.NotIn:
+			return prom.LabelNotMatches, nil
+		}
+	default:
+		// Since labels can only have one value, providing multiple
+		// values results in a regex match, even if that's not what the user
+		// asked for.
+		switch operator {
+		case selection.Equals, selection.DoubleEquals, selection.In, selection.Exists:
+			return prom.LabelMatches, nil
+		case selection.NotEquals, selection.DoesNotExist, selection.NotIn:
+			return prom.LabelNotMatches, nil
+		}
+	}
+
+	return nil, errors.New("operator not supported by query builder")
+}
+
+func (q *metricsQuery) selectTargetValue(operator selection.Operator, values []string) (string, error) {
+	switch len(values) {
+	case 0:
+		switch operator {
+		case selection.Exists, selection.DoesNotExist:
+			// Return an empty string when values are equal to 0
+			// When the operator is LabelNotMatches this will select series without the label
+			// or with the label but a value of "".
+			// When the operator is LabelMatches this will select series with the label
+			// whose value is NOT "".
+			return "", nil
+		case selection.Equals, selection.DoubleEquals, selection.NotEquals, selection.In, selection.NotIn:
+			return "", ErrMalformedQuery
+		}
+	case 1:
+		switch operator {
+		case selection.Equals, selection.DoubleEquals, selection.NotEquals, selection.In, selection.NotIn:
+			// Pass the value through as-is.
+			// It's somewhat strange to do this for both the regex and equality
+			// operators, but if we do it this way it gives the user a little more control.
+			// They might choose to send an "IN" request and give a list of static values
+			// or they could send a single value that's a regex, giving them a passthrough
+			// for their label selector.
+			return values[0], nil
+		case selection.Exists, selection.DoesNotExist:
+			return "", ErrQueryUnsupportedValues
+		}
+	default:
+		switch operator {
+		case selection.Equals, selection.DoubleEquals, selection.NotEquals, selection.In, selection.NotIn:
+			// Pass the value through as-is.
+			// It's somewhat strange to do this for both the regex and equality
+			// operators, but if we do it this way it gives the user a little more control.
+			// They might choose to send an "IN" request and give a list of static values
+			// or they could send a single value that's a regex, giving them a passthrough
+			// for their label selector.
+			return strings.Join(values, "|"), nil
+		case selection.Exists, selection.DoesNotExist:
+			return "", ErrQueryUnsupportedValues
+		}
+	}
+
+	return "", errors.New("operator not supported by query builder")
+}
+
+func (q *metricsQuery) operatorIsSupported(operator selection.Operator) bool {
+	return operator != selection.GreaterThan && operator != selection.LessThan
+}

pkg/naming/metrics_query_test.go

@@ -0,0 +1,453 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package naming
+
+import (
+	"fmt"
+	"testing"
+
+	labels "k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/selection"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+
+	pmodel "github.com/prometheus/common/model"
+)
+
+type resourceConverterMock struct {
+	namespaced bool
+}
+
+// ResourcesForSeries is a mock that returns a single group resource,
+// namely the series as a resource itself.
+func (rcm *resourceConverterMock) ResourcesForSeries(series prom.Series) (res []schema.GroupResource, namespaced bool) {
+	return []schema.GroupResource{{Resource: series.Name}}, rcm.namespaced
+}
+
+// LabelForResource is a mock that returns the label name,
+// simply by taking the given resource.
+func (rcm *resourceConverterMock) LabelForResource(gr schema.GroupResource) (pmodel.LabelName, error) {
+	return pmodel.LabelName(gr.Resource), nil
+}
+
+type checkFunc func(prom.Selector, error) error
+
+func hasError(want error) checkFunc {
+	return func(_ prom.Selector, got error) error {
+		if want != got {
+			return fmt.Errorf("got error %v, want %v", got, want)
+		}
+		return nil
+	}
+}
+
+func hasSelector(want string) checkFunc {
+	return func(got prom.Selector, _ error) error {
+		if prom.Selector(want) != got {
+			return fmt.Errorf("got selector %q, want %q", got, want)
+		}
+		return nil
+	}
+}
+
+func checks(cs ...checkFunc) checkFunc {
+	return func(s prom.Selector, e error) error {
+		for _, c := range cs {
+			if err := c(s, e); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+}
+
+func TestBuildSelector(t *testing.T) {
+	mustNewQuery := func(queryTemplate string, namespaced bool) MetricsQuery {
+		mq, err := NewMetricsQuery(queryTemplate, &resourceConverterMock{namespaced})
+		if err != nil {
+			t.Fatal(err)
+		}
+		return mq
+	}
+
+	mustNewLabelRequirement := func(key string, op selection.Operator, vals []string) *labels.Requirement {
+		req, err := labels.NewRequirement(key, op, vals)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return req
+	}
+
+	tests := []struct {
+		name string
+		mq   MetricsQuery
+
+		series         string
+		resource       schema.GroupResource
+		namespace      string
+		extraGroupBy   []string
+		metricSelector labels.Selector
+		names          []string
+
+		check checkFunc
+	}{
+		{
+			name: "series",
+
+			mq:             mustNewQuery(`series <<.Series>>`, false),
+			metricSelector: labels.NewSelector(),
+			series:         "foo",
+
+			check: checks(
+				hasError(nil),
+				hasSelector("series foo"),
+			),
+		},
+
+		{
+			name: "multiple LabelMatchers values",
+
+			mq:             mustNewQuery(`<<.LabelMatchers>>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+			names:          []string{"bar", "baz"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector(`resource=~"bar|baz"`),
+			),
+		},
+
+		{
+			name: "single LabelMatchers value",
+
+			mq:             mustNewQuery(`<<.LabelMatchers>>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+			names:          []string{"bar"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector(`resource="bar"`),
+			),
+		},
+
+		{
+			name: "LabelMatchers with additional metrics filter",
+
+			mq: mustNewQuery(`<<.LabelMatchers>>`, false),
+			metricSelector: labels.NewSelector().Add(
+				*mustNewLabelRequirement("metric1", selection.Equals, []string{"value1"}),
+			),
+			resource: schema.GroupResource{Group: "group", Resource: "resource"},
+			names:    []string{"bar"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector(`metric1="value1",resource="bar"`),
+			),
+		},
+
+		{
+			name: "single LabelValuesByName value",
+
+			mq:             mustNewQuery(`<<index .LabelValuesByName "resource">>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+			names:          []string{"bar"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector("bar"),
+			),
+		},
+
+		{
+			name: "multiple LabelValuesByName values",
+
+			mq:             mustNewQuery(`<<index .LabelValuesByName "resource">>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+			names:          []string{"bar", "baz"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector("bar|baz"),
+			),
+		},
+
+		{
+			name: "multiple LabelValuesByName values with namespace",
+
+			mq:             mustNewQuery(`<<index .LabelValuesByName "namespaces">> <<index .LabelValuesByName "resource">>`, true),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+			namespace:      "default",
+			names:          []string{"bar", "baz"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector("default bar|baz"),
+			),
+		},
+
+		{
+			name: "single GroupBy value",
+
+			mq:             mustNewQuery(`<<.GroupBy>>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector("resource"),
+			),
+		},
+
+		{
+			name: "multiple GroupBy values",
+
+			mq:             mustNewQuery(`<<.GroupBy>>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+			extraGroupBy:   []string{"extra", "groups"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector("resource,extra,groups"),
+			),
+		},
+
+		{
+			name: "single GroupBySlice value",
+
+			mq:             mustNewQuery(`<<.GroupBySlice>>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector("[resource]"),
+			),
+		},
+
+		{
+			name: "multiple GroupBySlice values",
+
+			mq:             mustNewQuery(`<<.GroupBySlice>>`, false),
+			metricSelector: labels.NewSelector(),
+			resource:       schema.GroupResource{Group: "group", Resource: "resource"},
+			extraGroupBy:   []string{"extra", "groups"},
+
+			check: checks(
+				hasError(nil),
+				hasSelector("[resource extra groups]"),
+			),
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			selector, err := tc.mq.Build(tc.series, tc.resource, tc.namespace, tc.extraGroupBy, tc.metricSelector, tc.names...)
+
+			if err := tc.check(selector, err); err != nil {
+				t.Error(err)
+			}
+		})
+	}
+}
+
+func TestBuildExternalSelector(t *testing.T) {
+	mustNewQuery := func(queryTemplate string) MetricsQuery {
+		mq, err := NewExternalMetricsQuery(queryTemplate, &resourceConverterMock{true}, true)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return mq
+	}
+
+	mustNewNonNamespacedQuery := func(queryTemplate string) MetricsQuery {
+		mq, err := NewExternalMetricsQuery(queryTemplate, &resourceConverterMock{true}, false)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return mq
+	}
+
+	mustNewLabelRequirement := func(key string, op selection.Operator, vals []string) *labels.Requirement {
+		req, err := labels.NewRequirement(key, op, vals)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return req
+	}
+
+	tests := []struct {
+		name string
+		mq   MetricsQuery
+
+		series         string
+		namespace      string
+		groupBy        string
+		groupBySlice   []string
+		metricSelector labels.Selector
+
+		check checkFunc
+	}{
+		{
+			name: "series",
+
+			mq:             mustNewQuery(`series <<.Series>>`),
+			series:         "foo",
+			metricSelector: labels.NewSelector(),
+
+			check: checks(
+				hasError(nil),
+				hasSelector("series foo"),
+			),
+		},
+		{
+			name: "single GroupBy value",
+
+			mq:             mustNewQuery(`<<.GroupBy>>`),
+			groupBy:        "foo",
+			metricSelector: labels.NewSelector(),
+
+			check: checks(
+				hasError(nil),
+				hasSelector("foo"),
+			),
+		},
+		{
+			name: "multiple GroupBySlice values",
+
+			mq:             mustNewQuery(`<<.GroupBySlice>>`),
+			groupBySlice:   []string{"foo", "bar"},
+			metricSelector: labels.NewSelector(),
+
+			check: checks(
+				hasError(nil),
+				hasSelector("[foo bar]"),
+			),
+		},
+		{
+			name: "multiple GroupBySlice values with namespace",
+
+			mq:             mustNewQuery(`<<index .LabelValuesByName "namespaces">> <<.GroupBySlice>>`),
+			namespace:      "default",
+			groupBySlice:   []string{"foo", "bar"},
+			metricSelector: labels.NewSelector(),
+
+			check: checks(
+				hasError(nil),
+				hasSelector("default [foo bar]"),
+			),
+		},
+		{
+			name: "multiple GroupBySlice values with namespace disabled",
+
+			mq:             mustNewNonNamespacedQuery(`<<index .LabelValuesByName "namespaces">> <<.GroupBySlice>>`),
+			namespace:      "default",
+			groupBySlice:   []string{"foo", "bar"},
+			metricSelector: labels.NewSelector(),
+
+			check: checks(
+				hasError(nil),
+				hasSelector(" [foo bar]"),
+			),
+		},
+		{
+			name: "single LabelMatchers value",
+
+			mq: mustNewQuery(`<<.LabelMatchers>>`),
+			metricSelector: labels.NewSelector().Add(
+				*mustNewLabelRequirement("foo", selection.Equals, []string{"bar"}),
+			),
+
+			check: checks(
+				hasError(nil),
+				hasSelector(`foo="bar"`),
+			),
+		},
+		{
+			name: "single LabelMatchers value with namespace",
+
+			mq:        mustNewQuery(`<<.LabelMatchers>>`),
+			namespace: "default",
+			metricSelector: labels.NewSelector().Add(
+				*mustNewLabelRequirement("foo", selection.Equals, []string{"bar"}),
+			),
+
+			check: checks(
+				hasError(nil),
+				hasSelector(`foo="bar",namespaces="default"`),
+			),
+		},
+		{
+			name: "multiple LabelMatchers value",
+
+			mq: mustNewQuery(`<<.LabelMatchers>>`),
+			metricSelector: labels.NewSelector().Add(
+				*mustNewLabelRequirement("foo", selection.Equals, []string{"bar"}),
+				*mustNewLabelRequirement("qux", selection.In, []string{"bar", "baz"}),
+			),
+
+			check: checks(
+				hasError(nil),
+				hasSelector(`foo="bar",qux=~"bar|baz"`),
+			),
+		},
+		{
+			name: "single LabelValuesByName value",
+
+			mq: mustNewQuery(`<<.LabelValuesByName>>`),
+			metricSelector: labels.NewSelector().Add(
+				*mustNewLabelRequirement("foo", selection.Equals, []string{"bar"}),
+			),
+
+			check: checks(
+				hasError(nil),
+				hasSelector("map[foo:bar]"),
+			),
+		},
+		{
+			name: "single LabelValuesByName with multiple selectors",
+
+			mq: mustNewQuery(`<<.LabelValuesByName>>`),
+			metricSelector: labels.NewSelector().Add(
+				*mustNewLabelRequirement("foo", selection.In, []string{"bar", "baz"}),
+			),
+
+			check: checks(
+				hasError(nil),
+				hasSelector("map[foo:bar|baz]"),
+			),
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			selector, err := tc.mq.BuildExternal(tc.series, tc.namespace, tc.groupBy, tc.groupBySlice, tc.metricSelector)
+			t.Logf("selector: '%v'", selector)
+
+			if err := tc.check(selector, err); err != nil {
+				t.Error(err)
+			}
+		})
+	}
+}

pkg/naming/regex_matcher_test.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package naming
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"sigs.k8s.io/prometheus-adapter/pkg/config"
+)
+
+func TestReMatcherIs(t *testing.T) {
+	filter := config.RegexFilter{
+		Is: "my_.*",
+	}
+
+	matcher, err := NewReMatcher(filter)
+	require.NoError(t, err)
+
+	result := matcher.Matches("my_label")
+	require.True(t, result)
+
+	result = matcher.Matches("your_label")
+	require.False(t, result)
+}
+
+func TestReMatcherIsNot(t *testing.T) {
+	filter := config.RegexFilter{
+		IsNot: "my_.*",
+	}
+
+	matcher, err := NewReMatcher(filter)
+	require.NoError(t, err)
+
+	result := matcher.Matches("my_label")
+	require.False(t, result)
+
+	result = matcher.Matches("your_label")
+	require.True(t, result)
+}
+
+func TestEnforcesIsOrIsNotButNotBoth(t *testing.T) {
+	filter := config.RegexFilter{
+		Is:    "my_.*",
+		IsNot: "your_.*",
+	}
+
+	_, err := NewReMatcher(filter)
+	require.Error(t, err)
+}

pkg/naming/resource_converter.go

@@ -0,0 +1,220 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package naming
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+	"sync"
+	"text/template"
+
+	pmodel "github.com/prometheus/common/model"
+
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/klog/v2"
+
+	"sigs.k8s.io/custom-metrics-apiserver/pkg/provider"
+
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/config"
+)
+
+var (
+	GroupNameSanitizer = strings.NewReplacer(".", "_", "-", "_")
+	NsGroupResource    = schema.GroupResource{Resource: "namespaces"}
+	NodeGroupResource  = schema.GroupResource{Resource: "nodes"}
+	PVGroupResource    = schema.GroupResource{Resource: "persistentvolumes"}
+)
+
+// ResourceConverter knows the relationship between Kubernetes group-resources and Prometheus labels,
+// and can convert between the two for any given label or series.
+type ResourceConverter interface {
+	// ResourcesForSeries returns the group-resources associated with the given series,
+	// as well as whether or not the given series has the "namespace" resource).
+	ResourcesForSeries(series prom.Series) (res []schema.GroupResource, namespaced bool)
+	// LabelForResource returns the appropriate label for the given resource.
+	LabelForResource(resource schema.GroupResource) (pmodel.LabelName, error)
+}
+
+type resourceConverter struct {
+	labelResourceMu   sync.RWMutex
+	labelToResource   map[pmodel.LabelName]schema.GroupResource
+	resourceToLabel   map[schema.GroupResource]pmodel.LabelName
+	labelResExtractor *labelGroupResExtractor
+	mapper            apimeta.RESTMapper
+	labelTemplate     *template.Template
+}
+
+// NewResourceConverter creates a ResourceConverter based on a generic template plus any overrides.
+// Either overrides or the template may be empty, but not both.
+func NewResourceConverter(resourceTemplate string, overrides map[string]config.GroupResource, mapper apimeta.RESTMapper) (ResourceConverter, error) {
+	converter := &resourceConverter{
+		labelToResource: make(map[pmodel.LabelName]schema.GroupResource),
+		resourceToLabel: make(map[schema.GroupResource]pmodel.LabelName),
+		mapper:          mapper,
+	}
+
+	if resourceTemplate != "" {
+		labelTemplate, err := template.New("resource-label").Delims("<<", ">>").Parse(resourceTemplate)
+		if err != nil {
+			return converter, fmt.Errorf("unable to parse label template %q: %v", resourceTemplate, err)
+		}
+		converter.labelTemplate = labelTemplate
+
+		labelResExtractor, err := newLabelGroupResExtractor(labelTemplate)
+		if err != nil {
+			return converter, fmt.Errorf("unable to generate label format from template %q: %v", resourceTemplate, err)
+		}
+		converter.labelResExtractor = labelResExtractor
+	}
+
+	// invert the structure for consistency with the template
+	for lbl, groupRes := range overrides {
+		infoRaw := provider.CustomMetricInfo{
+			GroupResource: schema.GroupResource{
+				Group:    groupRes.Group,
+				Resource: groupRes.Resource,
+			},
+		}
+		info, _, err := infoRaw.Normalized(converter.mapper)
+		if err != nil {
+			return nil, fmt.Errorf("unable to normalize group-resource %v: %v", groupRes, err)
+		}
+
+		converter.labelToResource[pmodel.LabelName(lbl)] = info.GroupResource
+		converter.resourceToLabel[info.GroupResource] = pmodel.LabelName(lbl)
+	}
+
+	return converter, nil
+}
+
+func (r *resourceConverter) LabelForResource(resource schema.GroupResource) (pmodel.LabelName, error) {
+	r.labelResourceMu.RLock()
+	// check if we have a cached copy or override
+	lbl, ok := r.resourceToLabel[resource]
+	r.labelResourceMu.RUnlock() // release before we call makeLabelForResource
+	if ok {
+		return lbl, nil
+	}
+
+	// NB: we don't actually care about the gap between releasing read lock
+	// and acquiring the write lock -- if we do duplicate work sometimes, so be
+	// it, as long as we're correct.
+
+	// otherwise, use the template and save the result
+	lbl, err := r.makeLabelForResource(resource)
+	if err != nil {
+		return "", fmt.Errorf("unable to convert resource %s into label: %v", resource.String(), err)
+	}
+	return lbl, nil
+}
+
+// makeLabelForResource constructs a label name for the given resource, and saves the result.
+// It must *not* be called under an existing lock.
+func (r *resourceConverter) makeLabelForResource(resource schema.GroupResource) (pmodel.LabelName, error) {
+	if r.labelTemplate == nil {
+		return "", fmt.Errorf("no generic resource label form specified for this metric")
+	}
+	buff := new(bytes.Buffer)
+
+	singularRes, err := r.mapper.ResourceSingularizer(resource.Resource)
+	if err != nil {
+		return "", fmt.Errorf("unable to singularize resource %s: %v", resource.String(), err)
+	}
+	convResource := schema.GroupResource{
+		Group:    GroupNameSanitizer.Replace(resource.Group),
+		Resource: singularRes,
+	}
+
+	if err := r.labelTemplate.Execute(buff, convResource); err != nil {
+		return "", err
+	}
+	if buff.Len() == 0 {
+		return "", fmt.Errorf("empty label produced by label template")
+	}
+	lbl := pmodel.LabelName(buff.String())
+
+	r.labelResourceMu.Lock()
+	defer r.labelResourceMu.Unlock()
+
+	r.resourceToLabel[resource] = lbl
+	r.labelToResource[lbl] = resource
+	return lbl, nil
+}
+
+func (r *resourceConverter) ResourcesForSeries(series prom.Series) ([]schema.GroupResource, bool) {
+	// use an updates map to avoid having to drop the read lock to update the cache
+	// until the end.  Since we'll probably have few updates after the first run,
+	// this should mean that we rarely have to hold the write lock.
+	var resources []schema.GroupResource
+	updates := make(map[pmodel.LabelName]schema.GroupResource)
+	namespaced := false
+
+	// use an anon func to get the right defer behavior
+	func() {
+		r.labelResourceMu.RLock()
+		defer r.labelResourceMu.RUnlock()
+
+		for lbl := range series.Labels {
+			var groupRes schema.GroupResource
+			var ok bool
+
+			// check if we have an override
+			if groupRes, ok = r.labelToResource[lbl]; ok {
+				resources = append(resources, groupRes)
+			} else if groupRes, ok = updates[lbl]; ok {
+				resources = append(resources, groupRes)
+			} else if r.labelResExtractor != nil {
+				// if not, check if it matches the form we expect, and if so,
+				// convert to a group-resource.
+				if groupRes, ok = r.labelResExtractor.GroupResourceForLabel(lbl); ok {
+					info, _, err := provider.CustomMetricInfo{GroupResource: groupRes}.Normalized(r.mapper)
+					if err != nil {
+						// this is likely to show up for a lot of labels, so make it a verbose info log
+						klog.V(9).Infof("unable to normalize group-resource %s from label %q, skipping: %v", groupRes.String(), lbl, err)
+						continue
+					}
+
+					groupRes = info.GroupResource
+					resources = append(resources, groupRes)
+					updates[lbl] = groupRes
+				}
+			}
+
+			if groupRes != NsGroupResource && groupRes != NodeGroupResource && groupRes != PVGroupResource {
+				namespaced = true
+			}
+		}
+	}()
+
+	// update the cache for next time.  This should only be called by discovery,
+	// so we don't really have to worry about the gap between read and write locks
+	// (plus, we don't care if someone else updates the cache first, since the results
+	// are necessarily the same, so at most we've done extra work).
+	if len(updates) > 0 {
+		r.labelResourceMu.Lock()
+		defer r.labelResourceMu.Unlock()
+
+		for lbl, groupRes := range updates {
+			r.labelToResource[lbl] = groupRes
+		}
+	}
+
+	return resources, namespaced
+}

pkg/resourceprovider/provider.go

@@ -0,0 +1,420 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package resourceprovider
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"sync"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/klog/v2"
+	metrics "k8s.io/metrics/pkg/apis/metrics"
+
+	"sigs.k8s.io/metrics-server/pkg/api"
+
+	"sigs.k8s.io/prometheus-adapter/pkg/client"
+	"sigs.k8s.io/prometheus-adapter/pkg/config"
+	"sigs.k8s.io/prometheus-adapter/pkg/naming"
+
+	pmodel "github.com/prometheus/common/model"
+)
+
+var (
+	nodeResource = schema.GroupResource{Resource: "nodes"}
+	podResource  = schema.GroupResource{Resource: "pods"}
+)
+
+// TODO(directxman12): consider support for nanocore values -- adjust scale if less than 1 millicore, or greater than max int64
+
+// newResourceQuery instantiates query information from the give configuration rule for querying
+// resource metrics for some resource.
+func newResourceQuery(cfg config.ResourceRule, mapper apimeta.RESTMapper) (resourceQuery, error) {
+	converter, err := naming.NewResourceConverter(cfg.Resources.Template, cfg.Resources.Overrides, mapper)
+	if err != nil {
+		return resourceQuery{}, fmt.Errorf("unable to construct label-resource converter: %v", err)
+	}
+
+	contQuery, err := naming.NewMetricsQuery(cfg.ContainerQuery, converter)
+	if err != nil {
+		return resourceQuery{}, fmt.Errorf("unable to construct container metrics query: %v", err)
+	}
+	nodeQuery, err := naming.NewMetricsQuery(cfg.NodeQuery, converter)
+	if err != nil {
+		return resourceQuery{}, fmt.Errorf("unable to construct node metrics query: %v", err)
+	}
+
+	return resourceQuery{
+		converter:      converter,
+		contQuery:      contQuery,
+		nodeQuery:      nodeQuery,
+		containerLabel: cfg.ContainerLabel,
+	}, nil
+}
+
+// resourceQuery represents query information for querying resource metrics for some resource,
+// like CPU or memory.
+type resourceQuery struct {
+	converter      naming.ResourceConverter
+	contQuery      naming.MetricsQuery
+	nodeQuery      naming.MetricsQuery
+	containerLabel string
+}
+
+// NewProvider constructs a new MetricsProvider to provide resource metrics from Prometheus using the given rules.
+func NewProvider(prom client.Client, mapper apimeta.RESTMapper, cfg *config.ResourceRules) (api.MetricsGetter, error) {
+	cpuQuery, err := newResourceQuery(cfg.CPU, mapper)
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct querier for CPU metrics: %v", err)
+	}
+	memQuery, err := newResourceQuery(cfg.Memory, mapper)
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct querier for memory metrics: %v", err)
+	}
+
+	return &resourceProvider{
+		prom:   prom,
+		cpu:    cpuQuery,
+		mem:    memQuery,
+		window: time.Duration(cfg.Window),
+	}, nil
+}
+
+// resourceProvider is a MetricsProvider that contacts Prometheus to provide
+// the resource metrics.
+type resourceProvider struct {
+	prom client.Client
+
+	cpu, mem resourceQuery
+
+	window time.Duration
+}
+
+// nsQueryResults holds the results of one set
+// of queries necessary to construct a resource metrics
+// API response for a single namespace.
+type nsQueryResults struct {
+	namespace string
+	cpu, mem  queryResults
+	err       error
+}
+
+// GetPodMetrics implements the api.MetricsProvider interface.
+func (p *resourceProvider) GetPodMetrics(pods ...*metav1.PartialObjectMetadata) ([]metrics.PodMetrics, error) {
+	resMetrics := make([]metrics.PodMetrics, 0, len(pods))
+
+	if len(pods) == 0 {
+		return resMetrics, nil
+	}
+
+	// TODO(directxman12): figure out how well this scales if we go to list 1000+ pods
+	// (and consider adding timeouts)
+
+	// group pods by namespace (we could be listing for all pods in the cluster)
+	podsByNs := make(map[string][]string, len(pods))
+	for _, pod := range pods {
+		podsByNs[pod.Namespace] = append(podsByNs[pod.Namespace], pod.Name)
+	}
+
+	// actually fetch the results for each namespace
+	now := pmodel.Now()
+	resChan := make(chan nsQueryResults, len(podsByNs))
+	var wg sync.WaitGroup
+	wg.Add(len(podsByNs))
+
+	for ns, podNames := range podsByNs {
+		go func(ns string, podNames []string) {
+			defer wg.Done()
+			resChan <- p.queryBoth(now, podResource, ns, podNames...)
+		}(ns, podNames)
+	}
+
+	wg.Wait()
+	close(resChan)
+
+	// index those results in a map for easy lookup
+	resultsByNs := make(map[string]nsQueryResults, len(podsByNs))
+	for result := range resChan {
+		if result.err != nil {
+			klog.Errorf("unable to fetch metrics for pods in namespace %q, skipping: %v", result.namespace, result.err)
+			continue
+		}
+		resultsByNs[result.namespace] = result
+	}
+
+	// convert the unorganized per-container results into results grouped
+	// together by namespace, pod, and container
+	for _, pod := range pods {
+		podMetric := p.assignForPod(pod, resultsByNs)
+		if podMetric != nil {
+			resMetrics = append(resMetrics, *podMetric)
+		}
+	}
+
+	return resMetrics, nil
+}
+
+// assignForPod takes the resource metrics for all containers in the given pod
+// from resultsByNs, and places them in MetricsProvider response format in resMetrics,
+// also recording the earliest time in resTime.  It will return without operating if
+// any data is missing.
+func (p *resourceProvider) assignForPod(pod *metav1.PartialObjectMetadata, resultsByNs map[string]nsQueryResults) *metrics.PodMetrics {
+	// check to make sure everything is present
+	nsRes, nsResPresent := resultsByNs[pod.Namespace]
+	if !nsResPresent {
+		klog.Errorf("unable to fetch metrics for pods in namespace %q, skipping pod %s", pod.Namespace, pod.String())
+		return nil
+	}
+	cpuRes, hasResult := nsRes.cpu[pod.Name]
+	if !hasResult {
+		klog.Errorf("unable to fetch CPU metrics for pod %s, skipping", pod.String())
+		return nil
+	}
+	memRes, hasResult := nsRes.mem[pod.Name]
+	if !hasResult {
+		klog.Errorf("unable to fetch memory metrics for pod %s, skipping", pod.String())
+		return nil
+	}
+
+	containerMetrics := make(map[string]metrics.ContainerMetrics)
+	earliestTS := pmodel.Latest
+
+	// organize all the CPU results
+	for _, cpu := range cpuRes {
+		containerName := string(cpu.Metric[pmodel.LabelName(p.cpu.containerLabel)])
+		if _, present := containerMetrics[containerName]; !present {
+			containerMetrics[containerName] = metrics.ContainerMetrics{
+				Name:  containerName,
+				Usage: corev1.ResourceList{},
+			}
+		}
+		containerMetrics[containerName].Usage[corev1.ResourceCPU] = *resource.NewMilliQuantity(int64(cpu.Value*1000.0), resource.DecimalSI)
+		if cpu.Timestamp.Before(earliestTS) {
+			earliestTS = cpu.Timestamp
+		}
+	}
+
+	// organize the memory results
+	for _, mem := range memRes {
+		containerName := string(mem.Metric[pmodel.LabelName(p.mem.containerLabel)])
+		if _, present := containerMetrics[containerName]; !present {
+			containerMetrics[containerName] = metrics.ContainerMetrics{
+				Name:  containerName,
+				Usage: corev1.ResourceList{},
+			}
+		}
+		containerMetrics[containerName].Usage[corev1.ResourceMemory] = *resource.NewMilliQuantity(int64(mem.Value*1000.0), resource.BinarySI)
+		if mem.Timestamp.Before(earliestTS) {
+			earliestTS = mem.Timestamp
+		}
+	}
+
+	// check for any containers that have either memory usage or CPU usage, but not both
+	for _, containerMetric := range containerMetrics {
+		_, hasMemory := containerMetric.Usage[corev1.ResourceMemory]
+		_, hasCPU := containerMetric.Usage[corev1.ResourceCPU]
+		if hasMemory && !hasCPU {
+			containerMetric.Usage[corev1.ResourceCPU] = *resource.NewMilliQuantity(int64(0), resource.BinarySI)
+		} else if hasCPU && !hasMemory {
+			containerMetric.Usage[corev1.ResourceMemory] = *resource.NewMilliQuantity(int64(0), resource.BinarySI)
+		}
+	}
+
+	podMetric := &metrics.PodMetrics{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:              pod.Name,
+			Namespace:         pod.Namespace,
+			Labels:            pod.Labels,
+			CreationTimestamp: metav1.Now(),
+		},
+		// store the time in the final format
+		Timestamp: metav1.NewTime(earliestTS.Time()),
+		Window:    metav1.Duration{Duration: p.window},
+	}
+
+	// store the container metrics in the final format
+	podMetric.Containers = make([]metrics.ContainerMetrics, 0, len(containerMetrics))
+	for _, containerMetric := range containerMetrics {
+		podMetric.Containers = append(podMetric.Containers, containerMetric)
+	}
+
+	return podMetric
+}
+
+// GetNodeMetrics implements the api.MetricsProvider interface.
+func (p *resourceProvider) GetNodeMetrics(nodes ...*corev1.Node) ([]metrics.NodeMetrics, error) {
+	resMetrics := make([]metrics.NodeMetrics, 0, len(nodes))
+
+	if len(nodes) == 0 {
+		return resMetrics, nil
+	}
+
+	now := pmodel.Now()
+	nodeNames := make([]string, 0, len(nodes))
+	for _, node := range nodes {
+		nodeNames = append(nodeNames, node.Name)
+	}
+
+	// run the actual query
+	qRes := p.queryBoth(now, nodeResource, "", nodeNames...)
+	if qRes.err != nil {
+		klog.Errorf("failed querying node metrics: %v", qRes.err)
+		return resMetrics, nil
+	}
+
+	// organize the results
+	for i, nodeName := range nodeNames {
+		// skip if any data is missing
+		rawCPUs, gotResult := qRes.cpu[nodeName]
+		if !gotResult {
+			klog.V(1).Infof("missing CPU for node %q, skipping", nodeName)
+			continue
+		}
+		rawMems, gotResult := qRes.mem[nodeName]
+		if !gotResult {
+			klog.V(1).Infof("missing memory for node %q, skipping", nodeName)
+			continue
+		}
+
+		rawMem := rawMems[0]
+		rawCPU := rawCPUs[0]
+
+		// use the earliest timestamp available (in order to be conservative
+		// when determining if metrics are tainted by startup)
+		ts := rawCPU.Timestamp.Time()
+		if ts.After(rawMem.Timestamp.Time()) {
+			ts = rawMem.Timestamp.Time()
+		}
+
+		// store the results
+		resMetrics = append(resMetrics, metrics.NodeMetrics{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:              nodes[i].Name,
+				Labels:            nodes[i].Labels,
+				CreationTimestamp: metav1.Now(),
+			},
+			Usage: corev1.ResourceList{
+				corev1.ResourceCPU:    *resource.NewMilliQuantity(int64(rawCPU.Value*1000.0), resource.DecimalSI),
+				corev1.ResourceMemory: *resource.NewMilliQuantity(int64(rawMem.Value*1000.0), resource.BinarySI),
+			},
+			Timestamp: metav1.NewTime(ts),
+			Window:    metav1.Duration{Duration: p.window},
+		})
+	}
+
+	return resMetrics, nil
+}
+
+// queryBoth queries for both CPU and memory metrics on the given
+// Kubernetes API resource (pods or nodes), and errors out if
+// either query fails.
+func (p *resourceProvider) queryBoth(now pmodel.Time, resource schema.GroupResource, namespace string, names ...string) nsQueryResults {
+	var cpuRes, memRes queryResults
+	var cpuErr, memErr error
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go func() {
+		defer wg.Done()
+		cpuRes, cpuErr = p.runQuery(now, p.cpu, resource, namespace, names...)
+	}()
+	go func() {
+		defer wg.Done()
+		memRes, memErr = p.runQuery(now, p.mem, resource, namespace, names...)
+	}()
+	wg.Wait()
+
+	if cpuErr != nil {
+		return nsQueryResults{
+			namespace: namespace,
+			err:       fmt.Errorf("unable to fetch node CPU metrics: %v", cpuErr),
+		}
+	}
+	if memErr != nil {
+		return nsQueryResults{
+			namespace: namespace,
+			err:       fmt.Errorf("unable to fetch node memory metrics: %v", memErr),
+		}
+	}
+
+	return nsQueryResults{
+		namespace: namespace,
+		cpu:       cpuRes,
+		mem:       memRes,
+	}
+}
+
+// queryResults maps an object name to all the results matching that object
+type queryResults map[string][]*pmodel.Sample
+
+// runQuery actually queries Prometheus for the metric represented by the given query information, on
+// the given Kubernetes API resource (pods or nodes).
+func (p *resourceProvider) runQuery(now pmodel.Time, queryInfo resourceQuery, resource schema.GroupResource, namespace string, names ...string) (queryResults, error) {
+	var query client.Selector
+	var err error
+
+	// build the query, which needs the special "container" group by if this is for pod metrics
+	if resource == nodeResource {
+		query, err = queryInfo.nodeQuery.Build("", resource, namespace, nil, labels.Everything(), names...)
+	} else {
+		extraGroupBy := []string{queryInfo.containerLabel}
+		query, err = queryInfo.contQuery.Build("", resource, namespace, extraGroupBy, labels.Everything(), names...)
+	}
+	if err != nil {
+		return nil, fmt.Errorf("unable to construct query: %v", err)
+	}
+
+	// run the query
+	rawRes, err := p.prom.Query(context.Background(), now, query)
+	if err != nil {
+		return nil, fmt.Errorf("unable to execute query: %v", err)
+	}
+
+	if rawRes.Type != pmodel.ValVector || rawRes.Vector == nil {
+		return nil, fmt.Errorf("invalid or empty value of non-vector type (%s) returned", rawRes.Type)
+	}
+
+	// check the appropriate label for the resource in question
+	resourceLbl, err := queryInfo.converter.LabelForResource(resource)
+	if err != nil {
+		return nil, fmt.Errorf("unable to find label for resource %s: %v", resource.String(), err)
+	}
+
+	// associate the results back to each given pod or node
+	res := make(queryResults, len(*rawRes.Vector))
+	for _, sample := range *rawRes.Vector {
+		// skip empty samples
+		if sample == nil {
+			continue
+		}
+		// replace NaN and negative values by zero
+		if math.IsNaN(float64(sample.Value)) || sample.Value < 0 {
+			sample.Value = 0
+		}
+		resKey := string(sample.Metric[resourceLbl])
+		res[resKey] = append(res[resKey], sample)
+	}
+
+	return res, nil
+}

pkg/resourceprovider/provider_suite_test.go

@@ -0,0 +1,29 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package resourceprovider
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func TestProvider(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Resource Metrics Provider Suite")
+}

pkg/resourceprovider/provider_test.go

@@ -0,0 +1,352 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package resourceprovider
+
+import (
+	"math"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/metrics/pkg/apis/metrics"
+
+	"sigs.k8s.io/metrics-server/pkg/api"
+
+	config "sigs.k8s.io/prometheus-adapter/cmd/config-gen/utils"
+	prom "sigs.k8s.io/prometheus-adapter/pkg/client"
+	fakeprom "sigs.k8s.io/prometheus-adapter/pkg/client/fake"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	pmodel "github.com/prometheus/common/model"
+)
+
+func restMapper() apimeta.RESTMapper {
+	mapper := apimeta.NewDefaultRESTMapper([]schema.GroupVersion{corev1.SchemeGroupVersion})
+
+	mapper.Add(corev1.SchemeGroupVersion.WithKind("Pod"), apimeta.RESTScopeNamespace)
+	mapper.Add(corev1.SchemeGroupVersion.WithKind("Node"), apimeta.RESTScopeRoot)
+	mapper.Add(corev1.SchemeGroupVersion.WithKind("Namespace"), apimeta.RESTScopeRoot)
+
+	return mapper
+}
+
+func buildPodSample(namespace, pod, container string, val float64, ts int64) *pmodel.Sample {
+	return &pmodel.Sample{
+		Metric: pmodel.Metric{
+			"namespace": pmodel.LabelValue(namespace),
+			"pod":       pmodel.LabelValue(pod),
+			"container": pmodel.LabelValue(container),
+		},
+		Value:     pmodel.SampleValue(val),
+		Timestamp: pmodel.Time(ts),
+	}
+}
+
+func buildNodeSample(node string, val float64, ts int64) *pmodel.Sample {
+	return &pmodel.Sample{
+		Metric: pmodel.Metric{
+			"instance": pmodel.LabelValue(node),
+			"id":       "/",
+		},
+		Value:     pmodel.SampleValue(val),
+		Timestamp: pmodel.Time(ts),
+	}
+}
+
+func buildQueryRes(metric string, samples ...*pmodel.Sample) prom.QueryResult {
+	for _, sample := range samples {
+		sample.Metric[pmodel.MetricNameLabel] = pmodel.LabelValue(metric)
+	}
+	vec := pmodel.Vector(samples)
+	return prom.QueryResult{
+		Type:   pmodel.ValVector,
+		Vector: &vec,
+	}
+}
+
+func mustBuild(sel prom.Selector, err error) prom.Selector {
+	Expect(err).NotTo(HaveOccurred())
+	return sel
+}
+
+func buildResList(cpu, memory float64) corev1.ResourceList {
+	return corev1.ResourceList{
+		corev1.ResourceCPU:    *resource.NewMilliQuantity(int64(cpu*1000.0), resource.DecimalSI),
+		corev1.ResourceMemory: *resource.NewMilliQuantity(int64(memory*1000.0), resource.BinarySI),
+	}
+}
+
+var _ = Describe("Resource Metrics Provider", func() {
+	var (
+		prov                   api.MetricsGetter
+		fakeProm               *fakeprom.FakePrometheusClient
+		cpuQueries, memQueries resourceQuery
+	)
+
+	BeforeEach(func() {
+		By("setting up a fake prometheus client and provider")
+		mapper := restMapper()
+
+		cfg := config.DefaultConfig(1*time.Minute, "")
+
+		var err error
+		cpuQueries, err = newResourceQuery(cfg.ResourceRules.CPU, mapper)
+		Expect(err).NotTo(HaveOccurred())
+		memQueries, err = newResourceQuery(cfg.ResourceRules.Memory, mapper)
+		Expect(err).NotTo(HaveOccurred())
+
+		fakeProm = &fakeprom.FakePrometheusClient{}
+		fakeProm.AcceptableInterval = pmodel.Interval{End: pmodel.Latest}
+
+		prov, err = NewProvider(fakeProm, restMapper(), cfg.ResourceRules)
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	It("should be able to list metrics pods across different namespaces", func() {
+		pods := []*metav1.PartialObjectMetadata{
+			{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod1"}},
+			{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod3"}},
+			{ObjectMeta: metav1.ObjectMeta{Namespace: "other-ns", Name: "pod27"}},
+		}
+		fakeProm.QueryResults = map[prom.Selector]prom.QueryResult{
+			mustBuild(cpuQueries.contQuery.Build("", podResource, "some-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod1", "pod3")): buildQueryRes("container_cpu_usage_seconds_total",
+				buildPodSample("some-ns", "pod1", "cont1", 1100.0, 10),
+				buildPodSample("some-ns", "pod1", "cont2", 1110.0, 20),
+				buildPodSample("some-ns", "pod3", "cont1", 1300.0, 10),
+				buildPodSample("some-ns", "pod3", "cont2", 1310.0, 20),
+			),
+			mustBuild(cpuQueries.contQuery.Build("", podResource, "other-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod27")): buildQueryRes("container_cpu_usage_seconds_total",
+				buildPodSample("other-ns", "pod27", "cont1", 2200.0, 270),
+			),
+			mustBuild(memQueries.contQuery.Build("", podResource, "some-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod1", "pod3")): buildQueryRes("container_memory_working_set_bytes",
+				buildPodSample("some-ns", "pod1", "cont1", 3100.0, 11),
+				buildPodSample("some-ns", "pod1", "cont2", 3110.0, 21),
+				buildPodSample("some-ns", "pod3", "cont1", 3300.0, 11),
+				buildPodSample("some-ns", "pod3", "cont2", 3310.0, 21),
+			),
+			mustBuild(memQueries.contQuery.Build("", podResource, "other-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod27")): buildQueryRes("container_memory_working_set_bytes",
+				buildPodSample("other-ns", "pod27", "cont1", 4200.0, 271),
+			),
+		}
+
+		By("querying for metrics for some pods")
+		podMetrics, err := prov.GetPodMetrics(pods...)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("verifying that metrics have been fetched for all the pods")
+		Expect(podMetrics).To(HaveLen(3))
+
+		By("verifying that the reported times for each are the earliest times for each pod")
+		Expect(podMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(podMetrics[0].Window.Duration).To(Equal(time.Minute))
+
+		Expect(podMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(podMetrics[1].Window.Duration).To(Equal(time.Minute))
+
+		Expect(podMetrics[2].Timestamp.Time).To(Equal(pmodel.Time(270).Time()))
+		Expect(podMetrics[2].Window.Duration).To(Equal(time.Minute))
+
+		By("verifying that the right metrics were fetched")
+		Expect(podMetrics).To(HaveLen(3))
+		Expect(podMetrics[0].Containers).To(ConsistOf(
+			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(1100.0, 3100.0)},
+			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1110.0, 3110.0)},
+		))
+		Expect(podMetrics[1].Containers).To(ConsistOf(
+			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(1300.0, 3300.0)},
+			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1310.0, 3310.0)},
+		))
+
+		Expect(podMetrics[2].Containers).To(ConsistOf(
+			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(2200.0, 4200.0)},
+		))
+	})
+
+	It("should return nil metrics for missing pods, but still return partial results", func() {
+		fakeProm.QueryResults = map[prom.Selector]prom.QueryResult{
+			mustBuild(cpuQueries.contQuery.Build("", podResource, "some-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod1", "pod-nonexistant")): buildQueryRes("container_cpu_usage_seconds_total",
+				buildPodSample("some-ns", "pod1", "cont1", 1100.0, 10),
+				buildPodSample("some-ns", "pod1", "cont2", 1110.0, 20),
+			),
+			mustBuild(memQueries.contQuery.Build("", podResource, "some-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod1", "pod-nonexistant")): buildQueryRes("container_memory_working_set_bytes",
+				buildPodSample("some-ns", "pod1", "cont1", 3100.0, 11),
+				buildPodSample("some-ns", "pod1", "cont2", 3110.0, 21),
+			),
+		}
+
+		By("querying for metrics for some pods, one of which is missing")
+		podMetrics, err := prov.GetPodMetrics(
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod1"}},
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod-nonexistant"}},
+		)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("verifying that the missing pod had no metrics")
+		Expect(podMetrics).To(HaveLen(1))
+
+		By("verifying that the rest of time metrics and times are correct")
+		Expect(podMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(podMetrics[0].Window.Duration).To(Equal(time.Minute))
+		Expect(podMetrics[0].Containers).To(ConsistOf(
+			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(1100.0, 3100.0)},
+			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1110.0, 3110.0)},
+		))
+	})
+
+	It("should return metrics of value zero when pod metrics have NaN or negative values", func() {
+		fakeProm.QueryResults = map[prom.Selector]prom.QueryResult{
+			mustBuild(cpuQueries.contQuery.Build("", podResource, "some-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod1", "pod3")): buildQueryRes("container_cpu_usage_seconds_total",
+				buildPodSample("some-ns", "pod1", "cont1", -1100.0, 10),
+				buildPodSample("some-ns", "pod1", "cont2", math.NaN(), 20),
+				buildPodSample("some-ns", "pod3", "cont1", -1300.0, 10),
+				buildPodSample("some-ns", "pod3", "cont2", 1310.0, 20),
+			),
+			mustBuild(memQueries.contQuery.Build("", podResource, "some-ns", []string{cpuQueries.containerLabel}, labels.Everything(), "pod1", "pod3")): buildQueryRes("container_memory_working_set_bytes",
+				buildPodSample("some-ns", "pod1", "cont1", 3100.0, 11),
+				buildPodSample("some-ns", "pod1", "cont2", -3110.0, 21),
+				buildPodSample("some-ns", "pod3", "cont1", math.NaN(), 11),
+				buildPodSample("some-ns", "pod3", "cont2", -3310.0, 21),
+			),
+		}
+
+		By("querying for metrics for some pods")
+		podMetrics, err := prov.GetPodMetrics(
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod1"}},
+			&metav1.PartialObjectMetadata{ObjectMeta: metav1.ObjectMeta{Namespace: "some-ns", Name: "pod3"}},
+		)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("verifying that metrics have been fetched for all the pods")
+		Expect(podMetrics).To(HaveLen(2))
+
+		By("verifying that the reported times for each are the earliest times for each pod")
+		Expect(podMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(podMetrics[0].Window.Duration).To(Equal(time.Minute))
+		Expect(podMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(podMetrics[1].Window.Duration).To(Equal(time.Minute))
+
+		By("verifying that NaN and negative values were replaced by zero")
+		Expect(podMetrics[0].Containers).To(ConsistOf(
+			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(0, 3100.0)},
+			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(0, 0)},
+		))
+		Expect(podMetrics[1].Containers).To(ConsistOf(
+			metrics.ContainerMetrics{Name: "cont1", Usage: buildResList(0, 0)},
+			metrics.ContainerMetrics{Name: "cont2", Usage: buildResList(1310.0, 0)},
+		))
+	})
+
+	It("should be able to list metrics for nodes", func() {
+		fakeProm.QueryResults = map[prom.Selector]prom.QueryResult{
+			mustBuild(cpuQueries.nodeQuery.Build("", nodeResource, "", nil, labels.Everything(), "node1", "node2")): buildQueryRes("container_cpu_usage_seconds_total",
+				buildNodeSample("node1", 1100.0, 10),
+				buildNodeSample("node2", 1200.0, 14),
+			),
+			mustBuild(memQueries.nodeQuery.Build("", nodeResource, "", nil, labels.Everything(), "node1", "node2")): buildQueryRes("container_memory_working_set_bytes",
+				buildNodeSample("node1", 2100.0, 11),
+				buildNodeSample("node2", 2200.0, 12),
+			),
+		}
+		By("querying for metrics for some nodes")
+		nodeMetrics, err := prov.GetNodeMetrics(
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node1"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node2"}},
+		)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("verifying that metrics have been fetched for all the nodes")
+		Expect(nodeMetrics).To(HaveLen(2))
+
+		By("verifying that the reported times for each are the earliest times for each node")
+		Expect(nodeMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(nodeMetrics[0].Window.Duration).To(Equal(time.Minute))
+		Expect(nodeMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(12).Time()))
+		Expect(nodeMetrics[1].Window.Duration).To(Equal(time.Minute))
+
+		By("verifying that the right metrics were fetched")
+		Expect(nodeMetrics[0].Usage).To(Equal(buildResList(1100.0, 2100.0)))
+		Expect(nodeMetrics[1].Usage).To(Equal(buildResList(1200.0, 2200.0)))
+	})
+
+	It("should return nil metrics for missing nodes, but still return partial results", func() {
+		fakeProm.QueryResults = map[prom.Selector]prom.QueryResult{
+			mustBuild(cpuQueries.nodeQuery.Build("", nodeResource, "", nil, labels.Everything(), "node1", "node2", "node3")): buildQueryRes("container_cpu_usage_seconds_total",
+				buildNodeSample("node1", 1100.0, 10),
+				buildNodeSample("node2", 1200.0, 14),
+			),
+			mustBuild(memQueries.nodeQuery.Build("", nodeResource, "", nil, labels.Everything(), "node1", "node2", "node3")): buildQueryRes("container_memory_working_set_bytes",
+				buildNodeSample("node1", 2100.0, 11),
+				buildNodeSample("node2", 2200.0, 12),
+			),
+		}
+		By("querying for metrics for some nodes, one of which is missing")
+		nodeMetrics, err := prov.GetNodeMetrics(
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node1"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node2"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node3"}},
+		)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("verifying that the missing pod had no metrics")
+		Expect(nodeMetrics).To(HaveLen(2))
+
+		By("verifying that the rest of time metrics and times are correct")
+		Expect(nodeMetrics[0].Usage).To(Equal(buildResList(1100.0, 2100.0)))
+		Expect(nodeMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(nodeMetrics[0].Window.Duration).To(Equal(time.Minute))
+		Expect(nodeMetrics[1].Usage).To(Equal(buildResList(1200.0, 2200.0)))
+		Expect(nodeMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(12).Time()))
+		Expect(nodeMetrics[1].Window.Duration).To(Equal(time.Minute))
+	})
+
+	It("should return metrics of value zero when node metrics have NaN or negative values", func() {
+		fakeProm.QueryResults = map[prom.Selector]prom.QueryResult{
+			mustBuild(cpuQueries.nodeQuery.Build("", nodeResource, "", nil, labels.Everything(), "node1", "node2")): buildQueryRes("container_cpu_usage_seconds_total",
+				buildNodeSample("node1", -1100.0, 10),
+				buildNodeSample("node2", 1200.0, 14),
+			),
+			mustBuild(memQueries.nodeQuery.Build("", nodeResource, "", nil, labels.Everything(), "node1", "node2")): buildQueryRes("container_memory_working_set_bytes",
+				buildNodeSample("node1", 2100.0, 11),
+				buildNodeSample("node2", math.NaN(), 12),
+			),
+		}
+		By("querying for metrics for some nodes")
+		nodeMetrics, err := prov.GetNodeMetrics(
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node1"}},
+			&corev1.Node{ObjectMeta: metav1.ObjectMeta{Name: "node2"}},
+		)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("verifying that metrics have been fetched for all the nodes")
+		Expect(nodeMetrics).To(HaveLen(2))
+
+		By("verifying that the reported times for each are the earliest times for each pod")
+		Expect(nodeMetrics[0].Timestamp.Time).To(Equal(pmodel.Time(10).Time()))
+		Expect(nodeMetrics[0].Window.Duration).To(Equal(time.Minute))
+		Expect(nodeMetrics[1].Timestamp.Time).To(Equal(pmodel.Time(12).Time()))
+		Expect(nodeMetrics[1].Window.Duration).To(Equal(time.Minute))
+
+		By("verifying that NaN and negative values were replaced by zero")
+		Expect(nodeMetrics[0].Usage).To(Equal(buildResList(0, 2100.0)))
+		Expect(nodeMetrics[1].Usage).To(Equal(buildResList(1200.0, 0)))
+	})
+})

test/README.md

@@ -0,0 +1,41 @@
+# End-to-end tests
+
+## With [kind](https://kind.sigs.k8s.io/)
+
+[`kind`](https://kind.sigs.k8s.io/) and `kubectl` are automatically downloaded
+except if `SKIP_INSTALL=true` is set.
+A `kind` cluster is automatically created before the tests, and deleted after
+the tests.
+The `prometheus-adapter` container image is build locally and imported
+into the cluster.
+
+```bash
+KIND_E2E=true make test-e2e
+```
+
+## With an existing Kubernetes cluster
+
+If you already have a Kubernetes cluster, you can use:
+
+```bash
+KUBECONFIG="/path/to/kube/config" REGISTRY="my.registry/prefix" make test-e2e
+```
+
+- The cluster should not have a namespace `prometheus-adapter-e2e`.
+  The namespace will be created and deleted as part of the E2E tests.
+- `KUBECONFIG` is the path of the [`kubeconfig` file].
+  **Optional**, defaults to `${HOME}/.kube/config`
+- `REGISTRY` is the image registry where the container image should be pushed.
+  **Required**.
+
+[`kubeconfig` file]: https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/
+
+## Additional environment variables
+
+These environment variables may also be used (with any non-empty value):
+
+- `SKIP_INSTALL`: skip the installation of `kind` and `kubectl` binaries;
+- `SKIP_CLEAN_AFTER`: skip the deletion of resources (`Kind` cluster or
+  Kubernetes namespace) and of the temporary directory `.e2e`;
+- `CLEAN_BEFORE`: clean before running the tests, e.g. if `SKIP_CLEAN_AFTER`
+  was used on the previous run.

test/e2e/e2e_test.go

@@ -0,0 +1,213 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"testing"
+	"time"
+
+	monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
+	monitoring "github.com/prometheus-operator/prometheus-operator/pkg/client/versioned"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/wait"
+	clientset "k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/tools/clientcmd"
+	metricsv1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"
+	metrics "k8s.io/metrics/pkg/client/clientset/versioned"
+)
+
+const (
+	ns                 = "prometheus-adapter-e2e"
+	prometheusInstance = "prometheus"
+	deployment         = "prometheus-adapter"
+)
+
+var (
+	client        clientset.Interface
+	promOpClient  monitoring.Interface
+	metricsClient metrics.Interface
+)
+
+func TestMain(m *testing.M) {
+	kubeconfig := os.Getenv("KUBECONFIG")
+	if len(kubeconfig) == 0 {
+		log.Fatal("KUBECONFIG not provided")
+	}
+
+	var err error
+	client, promOpClient, metricsClient, err = initializeClients(kubeconfig)
+	if err != nil {
+		log.Fatalf("Cannot create clients: %v", err)
+	}
+
+	ctx := context.Background()
+	err = waitForPrometheusReady(ctx, ns, prometheusInstance)
+	if err != nil {
+		log.Fatalf("Prometheus instance 'prometheus' not ready: %v", err)
+	}
+	err = waitForDeploymentReady(ctx, ns, deployment)
+	if err != nil {
+		log.Fatalf("Deployment prometheus-adapter not ready: %v", err)
+	}
+
+	exitVal := m.Run()
+	os.Exit(exitVal)
+}
+
+func initializeClients(kubeconfig string) (clientset.Interface, monitoring.Interface, metrics.Interface, error) {
+	cfg, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
+	if err != nil {
+		return nil, nil, nil, fmt.Errorf("Error during client configuration with %v", err)
+	}
+
+	clientSet, err := clientset.NewForConfig(cfg)
+	if err != nil {
+		return nil, nil, nil, fmt.Errorf("Error during client creation with %v", err)
+	}
+
+	promOpClient, err := monitoring.NewForConfig(cfg)
+	if err != nil {
+		return nil, nil, nil, fmt.Errorf("Error during dynamic client creation with %v", err)
+	}
+
+	metricsClientSet, err := metrics.NewForConfig(cfg)
+	if err != nil {
+		return nil, nil, nil, fmt.Errorf("Error during metrics client creation with %v", err)
+	}
+
+	return clientSet, promOpClient, metricsClientSet, nil
+}
+
+func waitForPrometheusReady(ctx context.Context, namespace string, name string) error {
+	return wait.PollUntilContextTimeout(ctx, 5*time.Second, 120*time.Second, true, func(ctx context.Context) (bool, error) {
+		prom, err := promOpClient.MonitoringV1().Prometheuses(ns).Get(ctx, name, metav1.GetOptions{})
+		if err != nil {
+			return false, err
+		}
+
+		var reconciled, available *monitoringv1.Condition
+		for _, condition := range prom.Status.Conditions {
+			cond := condition
+			if cond.Type == monitoringv1.Reconciled {
+				reconciled = &cond
+			} else if cond.Type == monitoringv1.Available {
+				available = &cond
+			}
+		}
+
+		if reconciled == nil {
+			log.Printf("Prometheus instance '%s': Waiting for reconciliation status...", name)
+			return false, nil
+		}
+		if reconciled.Status != monitoringv1.ConditionTrue {
+			log.Printf("Prometheus instance '%s': Reconciiled = %v. Waiting for reconciliation (reason %s, %q)...", name, reconciled.Status, reconciled.Reason, reconciled.Message)
+			return false, nil
+		}
+
+		specReplicas := *prom.Spec.Replicas
+		availableReplicas := prom.Status.AvailableReplicas
+		if specReplicas != availableReplicas {
+			log.Printf("Prometheus instance '%s': %v/%v pods are ready. Waiting for all pods to be ready...", name, availableReplicas, specReplicas)
+			return false, err
+		}
+
+		if available == nil {
+			log.Printf("Prometheus instance '%s': Waiting for Available status...", name)
+			return false, nil
+		}
+		if available.Status != monitoringv1.ConditionTrue {
+			log.Printf("Prometheus instance '%s': Available = %v. Waiting for Available status... (reason %s, %q)", name, available.Status, available.Reason, available.Message)
+			return false, nil
+		}
+
+		log.Printf("Prometheus instance '%s': Ready.", name)
+		return true, nil
+	})
+}
+
+func waitForDeploymentReady(ctx context.Context, namespace string, name string) error {
+	return wait.PollUntilContextTimeout(ctx, 5*time.Second, 30*time.Second, true, func(ctx context.Context) (bool, error) {
+		sts, err := client.AppsV1().Deployments(namespace).Get(ctx, name, metav1.GetOptions{})
+		if err != nil {
+			return false, err
+		}
+		if sts.Status.ReadyReplicas == *sts.Spec.Replicas {
+			log.Printf("Deployment %s: %v/%v pods are ready.", name, sts.Status.ReadyReplicas, *sts.Spec.Replicas)
+			return true, nil
+		}
+		log.Printf("Deployment %s: %v/%v pods are ready. Waiting for all pods to be ready...", name, sts.Status.ReadyReplicas, *sts.Spec.Replicas)
+		return false, nil
+	})
+}
+
+func TestNodeMetrics(t *testing.T) {
+	ctx := context.Background()
+	var nodeMetrics *metricsv1beta1.NodeMetricsList
+	err := wait.PollUntilContextTimeout(ctx, 2*time.Second, 30*time.Second, true, func(ctx context.Context) (bool, error) {
+		var err error
+		nodeMetrics, err = metricsClient.MetricsV1beta1().NodeMetricses().List(ctx, metav1.ListOptions{})
+		if err != nil {
+			return false, err
+		}
+		nonEmptyNodeMetrics := len(nodeMetrics.Items) > 0
+		if !nonEmptyNodeMetrics {
+			t.Logf("Node metrics empty... Retrying.")
+		}
+		return nonEmptyNodeMetrics, nil
+	})
+	require.NoErrorf(t, err, "Node metrics should not be empty")
+
+	for _, nodeMetric := range nodeMetrics.Items {
+		positiveMemory := nodeMetric.Usage.Memory().CmpInt64(0)
+		assert.Positivef(t, positiveMemory, "Memory usage for node %s is %v, should be > 0", nodeMetric.Name, nodeMetric.Usage.Memory())
+
+		positiveCPU := nodeMetric.Usage.Cpu().CmpInt64(0)
+		assert.Positivef(t, positiveCPU, "CPU usage for node %s is %v, should be > 0", nodeMetric.Name, nodeMetric.Usage.Cpu())
+	}
+}
+
+func TestPodMetrics(t *testing.T) {
+	ctx := context.Background()
+	var podMetrics *metricsv1beta1.PodMetricsList
+	err := wait.PollUntilContextTimeout(ctx, 2*time.Second, 30*time.Second, true, func(ctx context.Context) (bool, error) {
+		var err error
+		podMetrics, err = metricsClient.MetricsV1beta1().PodMetricses(ns).List(ctx, metav1.ListOptions{})
+		if err != nil {
+			return false, err
+		}
+		nonEmptyNodeMetrics := len(podMetrics.Items) > 0
+		if !nonEmptyNodeMetrics {
+			t.Logf("Pod metrics empty... Retrying.")
+		}
+		return nonEmptyNodeMetrics, nil
+	})
+	require.NoErrorf(t, err, "Pod metrics should not be empty")
+
+	for _, pod := range podMetrics.Items {
+		for _, containerMetric := range pod.Containers {
+			positiveMemory := containerMetric.Usage.Memory().CmpInt64(0)
+			assert.Positivef(t, positiveMemory, "Memory usage for pod %s/%s is %v, should be > 0", pod.Name, containerMetric.Name, containerMetric.Usage.Memory())
+		}
+	}
+}

test/prometheus-manifests/cluster-role-binding.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: prometheus
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: prometheus
+subjects:
+- kind: ServiceAccount
+  name: prometheus
+  namespace: prometheus-adapter-e2e

test/prometheus-manifests/cluster-role.yaml

@@ -0,0 +1,24 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: prometheus
+rules:
+- apiGroups: [""]
+  resources:
+  - nodes
+  - nodes/metrics
+  - services
+  - endpoints
+  - pods
+  verbs: ["get", "list", "watch"]
+- apiGroups: [""]
+  resources:
+  - configmaps
+  verbs: ["get"]
+- apiGroups:
+  - networking.k8s.io
+  resources:
+  - ingresses
+  verbs: ["get", "list", "watch"]
+- nonResourceURLs: ["/metrics"]
+  verbs: ["get"]

test/prometheus-manifests/prometheus.yaml

@@ -0,0 +1,9 @@
+apiVersion: monitoring.coreos.com/v1
+kind: Prometheus
+metadata:
+  name: prometheus
+  namespace: prometheus-adapter-e2e
+spec:
+  replicas: 2
+  serviceAccountName: prometheus
+  serviceMonitorSelector: {}

test/prometheus-manifests/service-account.yaml

@@ -0,0 +1,5 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: prometheus
+  namespace: prometheus-adapter-e2e

test/prometheus-manifests/service-monitor-kubelet.yaml

@@ -0,0 +1,25 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  labels:
+    app.kubernetes.io/name: kubelet
+  name: kubelet
+  namespace: prometheus-adapter-e2e
+spec:
+  endpoints:
+  - bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
+    honorLabels: true
+    honorTimestamps: false
+    interval: 10s
+    path: /metrics/resource
+    port: https-metrics
+    scheme: https
+    tlsConfig:
+      insecureSkipVerify: true
+  jobLabel: app.kubernetes.io/name
+  namespaceSelector:
+    matchNames:
+    - kube-system
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: kubelet

test/prometheus-manifests/service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: prometheus
+  namespace: prometheus-adapter-e2e
+spec:
+  ports:
+  - name: web
+    port: 9090
+    targetPort: web
+  selector:
+    app.kubernetes.io/instance: prometheus
+    app.kubernetes.io/name: prometheus
+  sessionAffinity: ClientIP