Check in the vendor directory

Travis seems to be having issues pulling deps, so we'll have to check in
the vendor directory and prevent the makefile from trying to regenerate
it normally.

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/apiserver.go

@@ -0,0 +1,108 @@
+/*
+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 apiserver
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/runtime/serializer"
+	"k8s.io/apimachinery/pkg/version"
+	genericapiserver "k8s.io/apiserver/pkg/server"
+
+	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
+	cminstall "k8s.io/metrics/pkg/apis/custom_metrics/install"
+	eminstall "k8s.io/metrics/pkg/apis/external_metrics/install"
+)
+
+var (
+	Scheme = runtime.NewScheme()
+	Codecs = serializer.NewCodecFactory(Scheme)
+)
+
+func init() {
+	cminstall.Install(Scheme)
+	eminstall.Install(Scheme)
+
+	// we need to add the options to empty v1
+	// TODO fix the server code to avoid this
+	metav1.AddToGroupVersion(Scheme, schema.GroupVersion{Version: "v1"})
+
+	// TODO: keep the generic API server from wanting this
+	unversioned := schema.GroupVersion{Group: "", Version: "v1"}
+	Scheme.AddUnversionedTypes(unversioned,
+		&metav1.Status{},
+		&metav1.APIVersions{},
+		&metav1.APIGroupList{},
+		&metav1.APIGroup{},
+		&metav1.APIResourceList{},
+	)
+}
+
+type Config struct {
+	GenericConfig *genericapiserver.Config
+}
+
+// CustomMetricsAdapterServer contains state for a Kubernetes cluster master/api server.
+type CustomMetricsAdapterServer struct {
+	GenericAPIServer        *genericapiserver.GenericAPIServer
+	customMetricsProvider   provider.CustomMetricsProvider
+	externalMetricsProvider provider.ExternalMetricsProvider
+}
+
+type completedConfig struct {
+	genericapiserver.CompletedConfig
+}
+
+// Complete fills in any fields not set that are required to have valid data. It's mutating the receiver.
+func (c *Config) Complete() completedConfig {
+	c.GenericConfig.Version = &version.Info{
+		Major: "1",
+		Minor: "0",
+	}
+	return completedConfig{c.GenericConfig.Complete(nil)}
+}
+
+// New returns a new instance of CustomMetricsAdapterServer from the given config.
+// name is used to differentiate for logging.
+// Each of the arguments: customMetricsProvider, externalMetricsProvider can be set either to
+// a provider implementation, or to nil to disable one of the APIs.
+func (c completedConfig) New(name string, customMetricsProvider provider.CustomMetricsProvider, externalMetricsProvider provider.ExternalMetricsProvider) (*CustomMetricsAdapterServer, error) {
+	genericServer, err := c.CompletedConfig.New(name, genericapiserver.NewEmptyDelegate()) // completion is done in Complete, no need for a second time
+	if err != nil {
+		return nil, err
+	}
+
+	s := &CustomMetricsAdapterServer{
+		GenericAPIServer:        genericServer,
+		customMetricsProvider:   customMetricsProvider,
+		externalMetricsProvider: externalMetricsProvider,
+	}
+
+	if customMetricsProvider != nil {
+		if err := s.InstallCustomMetricsAPI(); err != nil {
+			return nil, err
+		}
+	}
+	if externalMetricsProvider != nil {
+		if err := s.InstallExternalMetricsAPI(); err != nil {
+			return nil, err
+		}
+	}
+
+	return s, nil
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/cmapis.go

@@ -0,0 +1,85 @@
+/*
+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 apiserver
+
+import (
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	genericapi "k8s.io/apiserver/pkg/endpoints"
+	"k8s.io/apiserver/pkg/endpoints/discovery"
+	genericapiserver "k8s.io/apiserver/pkg/server"
+
+	specificapi "github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/installer"
+	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
+	metricstorage "github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/registry/custom_metrics"
+	"k8s.io/metrics/pkg/apis/custom_metrics"
+)
+
+func (s *CustomMetricsAdapterServer) InstallCustomMetricsAPI() error {
+	groupInfo := genericapiserver.NewDefaultAPIGroupInfo(custom_metrics.GroupName, Scheme, metav1.ParameterCodec, Codecs)
+
+	mainGroupVer := groupInfo.PrioritizedVersions[0]
+	preferredVersionForDiscovery := metav1.GroupVersionForDiscovery{
+		GroupVersion: mainGroupVer.String(),
+		Version:      mainGroupVer.Version,
+	}
+	groupVersion := metav1.GroupVersionForDiscovery{
+		GroupVersion: mainGroupVer.String(),
+		Version:      mainGroupVer.Version,
+	}
+	apiGroup := metav1.APIGroup{
+		Name:             mainGroupVer.Group,
+		Versions:         []metav1.GroupVersionForDiscovery{groupVersion},
+		PreferredVersion: preferredVersionForDiscovery,
+	}
+
+	cmAPI := s.cmAPI(&groupInfo, mainGroupVer)
+	if err := cmAPI.InstallREST(s.GenericAPIServer.Handler.GoRestfulContainer); err != nil {
+		return err
+	}
+
+	s.GenericAPIServer.DiscoveryGroupManager.AddGroup(apiGroup)
+	s.GenericAPIServer.Handler.GoRestfulContainer.Add(discovery.NewAPIGroupHandler(s.GenericAPIServer.Serializer, apiGroup).WebService())
+
+	return nil
+}
+
+func (s *CustomMetricsAdapterServer) cmAPI(groupInfo *genericapiserver.APIGroupInfo, groupVersion schema.GroupVersion) *specificapi.MetricsAPIGroupVersion {
+	resourceStorage := metricstorage.NewREST(s.customMetricsProvider)
+
+	return &specificapi.MetricsAPIGroupVersion{
+		DynamicStorage: resourceStorage,
+		APIGroupVersion: &genericapi.APIGroupVersion{
+			Root:             genericapiserver.APIGroupPrefix,
+			GroupVersion:     groupVersion,
+			MetaGroupVersion: groupInfo.MetaGroupVersion,
+
+			ParameterCodec:  groupInfo.ParameterCodec,
+			Serializer:      groupInfo.NegotiatedSerializer,
+			Creater:         groupInfo.Scheme,
+			Convertor:       groupInfo.Scheme,
+			UnsafeConvertor: runtime.UnsafeObjectConvertor(groupInfo.Scheme),
+			Typer:           groupInfo.Scheme,
+			Linker:          runtime.SelfLinker(meta.NewAccessor()),
+		},
+
+		ResourceLister: provider.NewCustomMetricResourceLister(s.customMetricsProvider),
+		Handlers:       &specificapi.CMHandlers{},
+	}
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/emapis.go

@@ -0,0 +1,85 @@
+/*
+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 apiserver
+
+import (
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	genericapi "k8s.io/apiserver/pkg/endpoints"
+	"k8s.io/apiserver/pkg/endpoints/discovery"
+	genericapiserver "k8s.io/apiserver/pkg/server"
+
+	specificapi "github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/installer"
+	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
+	metricstorage "github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/registry/external_metrics"
+	"k8s.io/metrics/pkg/apis/external_metrics"
+)
+
+// InstallExternalMetricsAPI registers the api server in Kube Aggregator
+func (s *CustomMetricsAdapterServer) InstallExternalMetricsAPI() error {
+	groupInfo := genericapiserver.NewDefaultAPIGroupInfo(external_metrics.GroupName, Scheme, metav1.ParameterCodec, Codecs)
+
+	mainGroupVer := groupInfo.PrioritizedVersions[0]
+	preferredVersionForDiscovery := metav1.GroupVersionForDiscovery{
+		GroupVersion: mainGroupVer.String(),
+		Version:      mainGroupVer.Version,
+	}
+	groupVersion := metav1.GroupVersionForDiscovery{
+		GroupVersion: mainGroupVer.String(),
+		Version:      mainGroupVer.Version,
+	}
+	apiGroup := metav1.APIGroup{
+		Name:             mainGroupVer.Group,
+		Versions:         []metav1.GroupVersionForDiscovery{groupVersion},
+		PreferredVersion: preferredVersionForDiscovery,
+	}
+
+	emAPI := s.emAPI(&groupInfo, mainGroupVer)
+	if err := emAPI.InstallREST(s.GenericAPIServer.Handler.GoRestfulContainer); err != nil {
+		return err
+	}
+
+	s.GenericAPIServer.DiscoveryGroupManager.AddGroup(apiGroup)
+	s.GenericAPIServer.Handler.GoRestfulContainer.Add(discovery.NewAPIGroupHandler(s.GenericAPIServer.Serializer, apiGroup).WebService())
+
+	return nil
+}
+
+func (s *CustomMetricsAdapterServer) emAPI(groupInfo *genericapiserver.APIGroupInfo, groupVersion schema.GroupVersion) *specificapi.MetricsAPIGroupVersion {
+	resourceStorage := metricstorage.NewREST(s.externalMetricsProvider)
+
+	return &specificapi.MetricsAPIGroupVersion{
+		DynamicStorage: resourceStorage,
+		APIGroupVersion: &genericapi.APIGroupVersion{
+			Root:             genericapiserver.APIGroupPrefix,
+			GroupVersion:     groupVersion,
+			MetaGroupVersion: groupInfo.MetaGroupVersion,
+
+			ParameterCodec:  groupInfo.ParameterCodec,
+			Serializer:      groupInfo.NegotiatedSerializer,
+			Creater:         groupInfo.Scheme,
+			Convertor:       groupInfo.Scheme,
+			UnsafeConvertor: runtime.UnsafeObjectConvertor(groupInfo.Scheme),
+			Typer:           groupInfo.Scheme,
+			Linker:          runtime.SelfLinker(meta.NewAccessor()),
+		},
+		ResourceLister: provider.NewExternalMetricResourceLister(s.externalMetricsProvider),
+		Handlers:       &specificapi.EMHandlers{},
+	}
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/installer/cmhandlers.go

@@ -0,0 +1,191 @@
+/*
+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 installer
+
+import (
+	"net/http"
+	gpath "path"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apiserver/pkg/endpoints/handlers"
+	"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
+	"k8s.io/apiserver/pkg/endpoints/metrics"
+	"k8s.io/apiserver/pkg/registry/rest"
+
+	"github.com/emicklei/go-restful"
+)
+
+type CMHandlers struct{}
+
+// registerResourceHandlers registers the resource handlers for custom metrics.
+// Compared to the normal installer, this plays fast and loose a bit, but should still
+// follow the API conventions.
+func (ch *CMHandlers) registerResourceHandlers(a *MetricsAPIInstaller, ws *restful.WebService) error {
+	optionsExternalVersion := a.group.GroupVersion
+	if a.group.OptionsExternalVersion != nil {
+		optionsExternalVersion = *a.group.OptionsExternalVersion
+	}
+
+	fqKindToRegister, err := a.getResourceKind(a.group.DynamicStorage)
+	if err != nil {
+		return err
+	}
+
+	kind := fqKindToRegister.Kind
+
+	lister := a.group.DynamicStorage.(rest.Lister)
+	list := lister.NewList()
+	listGVKs, _, err := a.group.Typer.ObjectKinds(list)
+	if err != nil {
+		return err
+	}
+	versionedListPtr, err := a.group.Creater.New(a.group.GroupVersion.WithKind(listGVKs[0].Kind))
+	if err != nil {
+		return err
+	}
+	versionedList := indirectArbitraryPointer(versionedListPtr)
+
+	versionedListOptions, err := a.group.Creater.New(optionsExternalVersion.WithKind("ListOptions"))
+	if err != nil {
+		return err
+	}
+
+	nameParam := ws.PathParameter("name", "name of the described resource").DataType("string")
+	resourceParam := ws.PathParameter("resource", "the name of the resource").DataType("string")
+	subresourceParam := ws.PathParameter("subresource", "the name of the subresource").DataType("string")
+
+	// metrics describing non-namespaced objects (e.g. nodes)
+	rootScopedParams := []*restful.Parameter{
+		resourceParam,
+		nameParam,
+		subresourceParam,
+	}
+	rootScopedPath := "{resource}/{name}/{subresource}"
+
+	// metrics describing namespaced objects (e.g. pods)
+	namespaceParam := ws.PathParameter("namespace", "object name and auth scope, such as for teams and projects").DataType("string")
+	namespacedParams := []*restful.Parameter{
+		namespaceParam,
+		resourceParam,
+		nameParam,
+		subresourceParam,
+	}
+	namespacedPath := "namespaces/{namespace}/{resource}/{name}/{subresource}"
+
+	namespaceSpecificPath := "namespaces/{namespace}/metrics/{name}"
+	namespaceSpecificParams := []*restful.Parameter{
+		namespaceParam,
+		nameParam,
+	}
+
+	mediaTypes, streamMediaTypes := negotiation.MediaTypesForSerializer(a.group.Serializer)
+	allMediaTypes := append(mediaTypes, streamMediaTypes...)
+	ws.Produces(allMediaTypes...)
+
+	reqScope := handlers.RequestScope{
+		Serializer:      a.group.Serializer,
+		ParameterCodec:  a.group.ParameterCodec,
+		Creater:         a.group.Creater,
+		Convertor:       a.group.Convertor,
+		Typer:           a.group.Typer,
+		UnsafeConvertor: a.group.UnsafeConvertor,
+
+		// TODO: support TableConvertor?
+
+		// TODO: This seems wrong for cross-group subresources. It makes an assumption that a subresource and its parent are in the same group version. Revisit this.
+		Resource:    a.group.GroupVersion.WithResource("*"),
+		Subresource: "*",
+		Kind:        fqKindToRegister,
+
+		MetaGroupVersion: metav1.SchemeGroupVersion,
+	}
+	if a.group.MetaGroupVersion != nil {
+		reqScope.MetaGroupVersion = *a.group.MetaGroupVersion
+	}
+
+	// we need one path for namespaced resources, one for non-namespaced resources
+	doc := "list custom metrics describing an object or objects"
+	reqScope.Namer = MetricsNaming{
+		handlers.ContextBasedNaming{
+			SelfLinker:         a.group.Linker,
+			ClusterScoped:      true,
+			SelfLinkPathPrefix: a.prefix + "/",
+		},
+	}
+
+	rootScopedHandler := metrics.InstrumentRouteFunc("LIST", "custom-metrics", "", "cluster", restfulListResource(lister, nil, reqScope, false, a.minRequestTimeout))
+
+	// install the root-scoped route
+	rootScopedRoute := ws.GET(rootScopedPath).To(rootScopedHandler).
+		Doc(doc).
+		Param(ws.QueryParameter("pretty", "If 'true', then the output is pretty printed.")).
+		Operation("list"+kind).
+		Produces(allMediaTypes...).
+		Returns(http.StatusOK, "OK", versionedList).
+		Writes(versionedList)
+	if err := addObjectParams(ws, rootScopedRoute, versionedListOptions); err != nil {
+		return err
+	}
+	addParams(rootScopedRoute, rootScopedParams)
+	ws.Route(rootScopedRoute)
+
+	// install the namespace-scoped route
+	reqScope.Namer = MetricsNaming{
+		handlers.ContextBasedNaming{
+			SelfLinker:         a.group.Linker,
+			ClusterScoped:      false,
+			SelfLinkPathPrefix: gpath.Join(a.prefix, "namespaces") + "/",
+		},
+	}
+	namespacedHandler := metrics.InstrumentRouteFunc("LIST", "custom-metrics-namespaced", "", "namespace", restfulListResource(lister, nil, reqScope, false, a.minRequestTimeout))
+	namespacedRoute := ws.GET(namespacedPath).To(namespacedHandler).
+		Doc(doc).
+		Param(ws.QueryParameter("pretty", "If 'true', then the output is pretty printed.")).
+		Operation("listNamespaced"+kind).
+		Produces(allMediaTypes...).
+		Returns(http.StatusOK, "OK", versionedList).
+		Writes(versionedList)
+	if err := addObjectParams(ws, namespacedRoute, versionedListOptions); err != nil {
+		return err
+	}
+	addParams(namespacedRoute, namespacedParams)
+	ws.Route(namespacedRoute)
+
+	// install the special route for metrics describing namespaces (last b/c we modify the context func)
+	reqScope.Namer = MetricsNaming{
+		handlers.ContextBasedNaming{
+			SelfLinker:         a.group.Linker,
+			ClusterScoped:      false,
+			SelfLinkPathPrefix: gpath.Join(a.prefix, "namespaces") + "/",
+		},
+	}
+	namespaceSpecificHandler := metrics.InstrumentRouteFunc("LIST", "custom-metrics-for-namespace", "", "cluster", restfulListResource(lister, nil, reqScope, false, a.minRequestTimeout))
+	namespaceSpecificRoute := ws.GET(namespaceSpecificPath).To(namespaceSpecificHandler).
+		Doc(doc).
+		Param(ws.QueryParameter("pretty", "If 'true', then the output is pretty printed.")).
+		Operation("read"+kind+"ForNamespace").
+		Produces(allMediaTypes...).
+		Returns(http.StatusOK, "OK", versionedList).
+		Writes(versionedList)
+	if err := addObjectParams(ws, namespaceSpecificRoute, versionedListOptions); err != nil {
+		return err
+	}
+	addParams(namespaceSpecificRoute, namespaceSpecificParams)
+	ws.Route(namespaceSpecificRoute)
+
+	return nil
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/installer/emhandlers.go

@@ -0,0 +1,125 @@
+/*
+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 installer
+
+import (
+	"net/http"
+	gpath "path"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apiserver/pkg/endpoints/handlers"
+	"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
+	"k8s.io/apiserver/pkg/endpoints/metrics"
+	"k8s.io/apiserver/pkg/registry/rest"
+
+	"github.com/emicklei/go-restful"
+)
+
+type EMHandlers struct{}
+
+// registerResourceHandlers registers the resource handlers for external metrics.
+// The implementation is based on corresponding registerResourceHandlers for Custom Metrics API
+func (ch *EMHandlers) registerResourceHandlers(a *MetricsAPIInstaller, ws *restful.WebService) error {
+	optionsExternalVersion := a.group.GroupVersion
+	if a.group.OptionsExternalVersion != nil {
+		optionsExternalVersion = *a.group.OptionsExternalVersion
+	}
+
+	fqKindToRegister, err := a.getResourceKind(a.group.DynamicStorage)
+	if err != nil {
+		return err
+	}
+
+	kind := fqKindToRegister.Kind
+
+	lister := a.group.DynamicStorage.(rest.Lister)
+	list := lister.NewList()
+	listGVKs, _, err := a.group.Typer.ObjectKinds(list)
+	if err != nil {
+		return err
+	}
+	versionedListPtr, err := a.group.Creater.New(a.group.GroupVersion.WithKind(listGVKs[0].Kind))
+	if err != nil {
+		return err
+	}
+	versionedList := indirectArbitraryPointer(versionedListPtr)
+
+	versionedListOptions, err := a.group.Creater.New(optionsExternalVersion.WithKind("ListOptions"))
+	if err != nil {
+		return err
+	}
+
+	namespaceParam := ws.PathParameter("namespace", "object name and auth scope, such as for teams and projects").DataType("string")
+	nameParam := ws.PathParameter("name", "name of the described resource").DataType("string")
+
+	externalMetricParams := []*restful.Parameter{
+		namespaceParam,
+		nameParam,
+	}
+	externalMetricPath := "namespaces" + "/{namespace}/{resource}"
+
+	mediaTypes, streamMediaTypes := negotiation.MediaTypesForSerializer(a.group.Serializer)
+	allMediaTypes := append(mediaTypes, streamMediaTypes...)
+	ws.Produces(allMediaTypes...)
+
+	reqScope := handlers.RequestScope{
+		Serializer:      a.group.Serializer,
+		ParameterCodec:  a.group.ParameterCodec,
+		Creater:         a.group.Creater,
+		Convertor:       a.group.Convertor,
+		Typer:           a.group.Typer,
+		UnsafeConvertor: a.group.UnsafeConvertor,
+
+		// TODO: support TableConvertor?
+
+		// TODO: This seems wrong for cross-group subresources. It makes an assumption that a subresource and its parent are in the same group version. Revisit this.
+		Resource:    a.group.GroupVersion.WithResource("*"),
+		Subresource: "*",
+		Kind:        fqKindToRegister,
+
+		MetaGroupVersion: metav1.SchemeGroupVersion,
+	}
+	if a.group.MetaGroupVersion != nil {
+		reqScope.MetaGroupVersion = *a.group.MetaGroupVersion
+	}
+
+	doc := "list external metrics"
+	reqScope.Namer = MetricsNaming{
+		handlers.ContextBasedNaming{
+			SelfLinker:         a.group.Linker,
+			ClusterScoped:      false,
+			SelfLinkPathPrefix: gpath.Join(a.prefix, "namespaces") + "/",
+		},
+	}
+
+	externalMetricHandler := metrics.InstrumentRouteFunc("LIST", "external-metrics", "", "", restfulListResource(lister, nil, reqScope, false, a.minRequestTimeout))
+
+	externalMetricRoute := ws.GET(externalMetricPath).To(externalMetricHandler).
+		Doc(doc).
+		Param(ws.QueryParameter("pretty", "If 'true', then the output is pretty printed.")).
+		Operation("list"+kind).
+		Produces(allMediaTypes...).
+		Returns(http.StatusOK, "OK", versionedList).
+		Writes(versionedList)
+	if err := addObjectParams(ws, externalMetricRoute, versionedListOptions); err != nil {
+		return err
+	}
+	addParams(externalMetricRoute, externalMetricParams)
+	ws.Route(externalMetricRoute)
+
+	return nil
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver/installer/installer.go

@@ -0,0 +1,288 @@
+/*
+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 installer
+
+import (
+	"fmt"
+	gpath "path"
+	"reflect"
+	"strings"
+	"time"
+
+	"k8s.io/apimachinery/pkg/conversion"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+	"k8s.io/apiserver/pkg/endpoints"
+	"k8s.io/apiserver/pkg/endpoints/discovery"
+	"k8s.io/apiserver/pkg/endpoints/handlers"
+	"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
+	"k8s.io/apiserver/pkg/endpoints/request"
+	"k8s.io/apiserver/pkg/registry/rest"
+
+	"github.com/emicklei/go-restful"
+)
+
+// NB: the contents of this file should mostly be a subset of the functionality
+// in "k8s.io/apiserver/pkg/endpoints".  It would be nice to eventual figure out
+// a way to not have to recreate/copy a bunch of the structure from the normal API
+// installer, so that this trivially tracks changes to the main installer.
+
+// MetricsAPIGroupVersion is similar to "k8s.io/apiserver/pkg/endpoints".APIGroupVersion,
+// except that it installs the metrics REST handlers, which use wildcard resources
+// and subresources.
+//
+// This basically only serves the limitted use case required by the metrics API server --
+// the only verb accepted is GET (and perhaps WATCH in the future).
+type MetricsAPIGroupVersion struct {
+	DynamicStorage rest.Storage
+
+	*endpoints.APIGroupVersion
+
+	ResourceLister discovery.APIResourceLister
+
+	Handlers apiHandlers
+}
+
+type apiHandlers interface {
+	registerResourceHandlers(a *MetricsAPIInstaller, ws *restful.WebService) error
+}
+
+// InstallDynamicREST registers the dynamic REST handlers into a restful Container.
+// It is expected that the provided path root prefix will serve all operations.  Root MUST
+// NOT end in a slash.  It should mirror InstallREST in the plain APIGroupVersion.
+func (g *MetricsAPIGroupVersion) InstallREST(container *restful.Container) error {
+	installer := g.newDynamicInstaller()
+	ws := installer.NewWebService()
+
+	registrationErrors := installer.Install(ws)
+	lister := g.ResourceLister
+	if lister == nil {
+		return fmt.Errorf("must provide a dynamic lister for dynamic API groups")
+	}
+	versionDiscoveryHandler := discovery.NewAPIVersionHandler(g.Serializer, g.GroupVersion, lister)
+	versionDiscoveryHandler.AddToWebService(ws)
+	container.Add(ws)
+	return utilerrors.NewAggregate(registrationErrors)
+}
+
+// newDynamicInstaller is a helper to create the installer.  It mirrors
+// newInstaller in APIGroupVersion.
+func (g *MetricsAPIGroupVersion) newDynamicInstaller() *MetricsAPIInstaller {
+	prefix := gpath.Join(g.Root, g.GroupVersion.Group, g.GroupVersion.Version)
+	installer := &MetricsAPIInstaller{
+		group:             g,
+		prefix:            prefix,
+		minRequestTimeout: g.MinRequestTimeout,
+		handlers:          g.Handlers,
+	}
+
+	return installer
+}
+
+// MetricsAPIInstaller is a specialized API installer for the metrics API.
+// It is intended to be fully compliant with the Kubernetes API server conventions,
+// but serves wildcard resource/subresource routes instead of hard-coded resources
+// and subresources.
+type MetricsAPIInstaller struct {
+	group             *MetricsAPIGroupVersion
+	prefix            string // Path prefix where API resources are to be registered.
+	minRequestTimeout time.Duration
+	handlers          apiHandlers
+
+	// TODO: do we want to embed a normal API installer here so we can serve normal
+	// endpoints side by side with dynamic ones (from the same API group)?
+}
+
+// Install installs handlers for External Metrics API resources.
+func (a *MetricsAPIInstaller) Install(ws *restful.WebService) (errors []error) {
+	errors = make([]error, 0)
+
+	err := a.handlers.registerResourceHandlers(a, ws)
+	if err != nil {
+		errors = append(errors, fmt.Errorf("error in registering custom metrics resource: %v", err))
+	}
+
+	return errors
+}
+
+// NewWebService creates a new restful webservice with the api installer's prefix and version.
+func (a *MetricsAPIInstaller) NewWebService() *restful.WebService {
+	ws := new(restful.WebService)
+	ws.Path(a.prefix)
+	// a.prefix contains "prefix/group/version"
+	ws.Doc("API at " + a.prefix)
+	// Backwards compatibility, we accepted objects with empty content-type at V1.
+	// If we stop using go-restful, we can default empty content-type to application/json on an
+	// endpoint by endpoint basis
+	ws.Consumes("*/*")
+	mediaTypes, streamMediaTypes := negotiation.MediaTypesForSerializer(a.group.Serializer)
+	ws.Produces(append(mediaTypes, streamMediaTypes...)...)
+	ws.ApiVersion(a.group.GroupVersion.String())
+
+	return ws
+}
+
+// This magic incantation returns *ptrToObject for an arbitrary pointer
+func indirectArbitraryPointer(ptrToObject interface{}) interface{} {
+	return reflect.Indirect(reflect.ValueOf(ptrToObject)).Interface()
+}
+
+// getResourceKind returns the external group version kind registered for the given storage object.
+func (a *MetricsAPIInstaller) getResourceKind(storage rest.Storage) (schema.GroupVersionKind, error) {
+	object := storage.New()
+	fqKinds, _, err := a.group.Typer.ObjectKinds(object)
+	if err != nil {
+		return schema.GroupVersionKind{}, err
+	}
+
+	// a given go type can have multiple potential fully qualified kinds.  Find the one that corresponds with the group
+	// we're trying to register here
+	fqKindToRegister := schema.GroupVersionKind{}
+	for _, fqKind := range fqKinds {
+		if fqKind.Group == a.group.GroupVersion.Group {
+			fqKindToRegister = a.group.GroupVersion.WithKind(fqKind.Kind)
+			break
+		}
+
+		// TODO: keep rid of extensions api group dependency here
+		// This keeps it doing what it was doing before, but it doesn't feel right.
+		if fqKind.Group == "extensions" && fqKind.Kind == "ThirdPartyResourceData" {
+			fqKindToRegister = a.group.GroupVersion.WithKind(fqKind.Kind)
+		}
+	}
+	if fqKindToRegister.Empty() {
+		return schema.GroupVersionKind{}, fmt.Errorf("unable to locate fully qualified kind for %v: found %v when registering for %v", reflect.TypeOf(object), fqKinds, a.group.GroupVersion)
+	}
+	return fqKindToRegister, nil
+}
+
+func addParams(route *restful.RouteBuilder, params []*restful.Parameter) {
+	for _, param := range params {
+		route.Param(param)
+	}
+}
+
+// addObjectParams converts a runtime.Object into a set of go-restful Param() definitions on the route.
+// The object must be a pointer to a struct; only fields at the top level of the struct that are not
+// themselves interfaces or structs are used; only fields with a json tag that is non empty (the standard
+// Go JSON behavior for omitting a field) become query parameters. The name of the query parameter is
+// the JSON field name. If a description struct tag is set on the field, that description is used on the
+// query parameter. In essence, it converts a standard JSON top level object into a query param schema.
+func addObjectParams(ws *restful.WebService, route *restful.RouteBuilder, obj interface{}) error {
+	sv, err := conversion.EnforcePtr(obj)
+	if err != nil {
+		return err
+	}
+	st := sv.Type()
+	switch st.Kind() {
+	case reflect.Struct:
+		for i := 0; i < st.NumField(); i++ {
+			name := st.Field(i).Name
+			sf, ok := st.FieldByName(name)
+			if !ok {
+				continue
+			}
+			switch sf.Type.Kind() {
+			case reflect.Interface, reflect.Struct:
+			case reflect.Ptr:
+				// TODO: This is a hack to let metav1.Time through. This needs to be fixed in a more generic way eventually. bug #36191
+				if (sf.Type.Elem().Kind() == reflect.Interface || sf.Type.Elem().Kind() == reflect.Struct) && strings.TrimPrefix(sf.Type.String(), "*") != "metav1.Time" {
+					continue
+				}
+				fallthrough
+			default:
+				jsonTag := sf.Tag.Get("json")
+				if len(jsonTag) == 0 {
+					continue
+				}
+				jsonName := strings.SplitN(jsonTag, ",", 2)[0]
+				if len(jsonName) == 0 {
+					continue
+				}
+
+				var desc string
+				if docable, ok := obj.(documentable); ok {
+					desc = docable.SwaggerDoc()[jsonName]
+				}
+				route.Param(ws.QueryParameter(jsonName, desc).DataType(typeToJSON(sf.Type.String())))
+			}
+		}
+	}
+	return nil
+}
+
+// TODO: this is incomplete, expand as needed.
+// Convert the name of a golang type to the name of a JSON type
+func typeToJSON(typeName string) string {
+	switch typeName {
+	case "bool", "*bool":
+		return "boolean"
+	case "uint8", "*uint8", "int", "*int", "int32", "*int32", "int64", "*int64", "uint32", "*uint32", "uint64", "*uint64":
+		return "integer"
+	case "float64", "*float64", "float32", "*float32":
+		return "number"
+	case "metav1.Time", "*metav1.Time":
+		return "string"
+	case "byte", "*byte":
+		return "string"
+	case "v1.DeletionPropagation", "*v1.DeletionPropagation":
+		return "string"
+
+	// TODO: Fix these when go-restful supports a way to specify an array query param:
+	// https://github.com/emicklei/go-restful/issues/225
+	case "[]string", "[]*string":
+		return "string"
+	case "[]int32", "[]*int32":
+		return "integer"
+
+	default:
+		return typeName
+	}
+}
+
+// An interface to see if an object supports swagger documentation as a method
+type documentable interface {
+	SwaggerDoc() map[string]string
+}
+
+// MetricsNaming is similar to handlers.ContextBasedNaming, except that it handles
+// polymorphism over subresources.
+type MetricsNaming struct {
+	handlers.ContextBasedNaming
+}
+
+func (n MetricsNaming) GenerateLink(requestInfo *request.RequestInfo, obj runtime.Object) (uri string, err error) {
+	if requestInfo.Resource != "metrics" {
+		n.SelfLinkPathSuffix += "/" + requestInfo.Subresource
+	}
+
+	// since this is not a pointer receiver, it's ok to modify it here
+	// (since we copy around every method call)
+	if n.ClusterScoped {
+		n.SelfLinkPathPrefix += requestInfo.Resource + "/"
+		return n.ContextBasedNaming.GenerateLink(requestInfo, obj)
+	}
+
+	return n.ContextBasedNaming.GenerateLink(requestInfo, obj)
+}
+
+func restfulListResource(r rest.Lister, rw rest.Watcher, scope handlers.RequestScope, forceWatch bool, minRequestTimeout time.Duration) restful.RouteFunction {
+	return func(req *restful.Request, res *restful.Response) {
+		handlers.ListResource(r, rw, scope, forceWatch, minRequestTimeout)(res.ResponseWriter, req.Request)
+	}
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/cmd/server/start.go

@@ -0,0 +1,87 @@
+/*
+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 server
+
+import (
+	"fmt"
+	"io"
+	"net"
+
+	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/apiserver"
+	genericapiserver "k8s.io/apiserver/pkg/server"
+	genericoptions "k8s.io/apiserver/pkg/server/options"
+)
+
+type CustomMetricsAdapterServerOptions struct {
+	// genericoptions.ReccomendedOptions - EtcdOptions
+	SecureServing  *genericoptions.SecureServingOptionsWithLoopback
+	Authentication *genericoptions.DelegatingAuthenticationOptions
+	Authorization  *genericoptions.DelegatingAuthorizationOptions
+	Features       *genericoptions.FeatureOptions
+
+	StdOut io.Writer
+	StdErr io.Writer
+}
+
+func NewCustomMetricsAdapterServerOptions(out, errOut io.Writer) *CustomMetricsAdapterServerOptions {
+	o := &CustomMetricsAdapterServerOptions{
+		SecureServing:  genericoptions.WithLoopback(genericoptions.NewSecureServingOptions()),
+		Authentication: genericoptions.NewDelegatingAuthenticationOptions(),
+		Authorization:  genericoptions.NewDelegatingAuthorizationOptions(),
+		Features:       genericoptions.NewFeatureOptions(),
+
+		StdOut: out,
+		StdErr: errOut,
+	}
+
+	return o
+}
+
+func (o CustomMetricsAdapterServerOptions) Validate(args []string) error {
+	return nil
+}
+
+func (o *CustomMetricsAdapterServerOptions) Complete() error {
+	return nil
+}
+
+func (o CustomMetricsAdapterServerOptions) Config() (*apiserver.Config, error) {
+	// TODO have a "real" external address (have an AdvertiseAddress?)
+	if err := o.SecureServing.MaybeDefaultWithSelfSignedCerts("localhost", nil, []net.IP{net.ParseIP("127.0.0.1")}); err != nil {
+		return nil, fmt.Errorf("error creating self-signed certificates: %v", err)
+	}
+
+	serverConfig := genericapiserver.NewConfig(apiserver.Codecs)
+	if err := o.SecureServing.ApplyTo(serverConfig); err != nil {
+		return nil, err
+	}
+
+	if err := o.Authentication.ApplyTo(&serverConfig.Authentication, serverConfig.SecureServing, nil); err != nil {
+		return nil, err
+	}
+	if err := o.Authorization.ApplyTo(&serverConfig.Authorization); err != nil {
+		return nil, err
+	}
+
+	// TODO: we can't currently serve swagger because we don't have a good way to dynamically update it
+	// serverConfig.SwaggerConfig = genericapiserver.DefaultSwaggerConfig()
+
+	config := &apiserver.Config{
+		GenericConfig: serverConfig,
+	}
+	return config, nil
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/dynamicmapper/fake_discovery.go

@@ -0,0 +1,152 @@
+/*
+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 dynamicmapper
+
+import (
+	"fmt"
+
+	"github.com/emicklei/go-restful-swagger12"
+	"github.com/googleapis/gnostic/OpenAPIv2"
+
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/version"
+	kubeversion "k8s.io/client-go/pkg/version"
+	restclient "k8s.io/client-go/rest"
+	"k8s.io/client-go/testing"
+)
+
+// NB: this is a copy of k8s.io/client-go/discovery/fake.  The original returns `nil, nil`
+// for some methods, which is generally confuses lots of code.
+
+type FakeDiscovery struct {
+	*testing.Fake
+}
+
+func (c *FakeDiscovery) ServerResourcesForGroupVersion(groupVersion string) (*metav1.APIResourceList, error) {
+	action := testing.ActionImpl{
+		Verb:     "get",
+		Resource: schema.GroupVersionResource{Resource: "resource"},
+	}
+	c.Invokes(action, nil)
+	for _, resourceList := range c.Resources {
+		if resourceList.GroupVersion == groupVersion {
+			return resourceList, nil
+		}
+	}
+	return nil, fmt.Errorf("GroupVersion %q not found", groupVersion)
+}
+
+func (c *FakeDiscovery) ServerResources() ([]*metav1.APIResourceList, error) {
+	action := testing.ActionImpl{
+		Verb:     "get",
+		Resource: schema.GroupVersionResource{Resource: "resource"},
+	}
+	c.Invokes(action, nil)
+	return c.Resources, nil
+}
+
+func (c *FakeDiscovery) ServerPreferredResources() ([]*metav1.APIResourceList, error) {
+	return nil, nil
+}
+
+func (c *FakeDiscovery) ServerPreferredNamespacedResources() ([]*metav1.APIResourceList, error) {
+	return nil, nil
+}
+
+func (c *FakeDiscovery) ServerGroups() (*metav1.APIGroupList, error) {
+	groups := map[string]*metav1.APIGroup{}
+	groupVersions := map[metav1.GroupVersionForDiscovery]struct{}{}
+	for _, resourceList := range c.Resources {
+		groupVer, err := schema.ParseGroupVersion(resourceList.GroupVersion)
+		if err != nil {
+			return nil, err
+		}
+		groupVerForDisc := metav1.GroupVersionForDiscovery{
+			GroupVersion: resourceList.GroupVersion,
+			Version:      groupVer.Version,
+		}
+
+		group, groupPresent := groups[groupVer.Group]
+		if !groupPresent {
+			group = &metav1.APIGroup{
+				Name: groupVer.Group,
+				// use the fist seen version as the preferred version
+				PreferredVersion: groupVerForDisc,
+			}
+			groups[groupVer.Group] = group
+		}
+
+		// we'll dedup in the end by deleting the group-versions
+		// from the global map one at a time
+		group.Versions = append(group.Versions, groupVerForDisc)
+		groupVersions[groupVerForDisc] = struct{}{}
+	}
+
+	groupList := make([]metav1.APIGroup, 0, len(groups))
+	for _, group := range groups {
+		newGroup := metav1.APIGroup{
+			Name:             group.Name,
+			PreferredVersion: group.PreferredVersion,
+		}
+
+		for _, groupVer := range group.Versions {
+			if _, ok := groupVersions[groupVer]; ok {
+				delete(groupVersions, groupVer)
+				newGroup.Versions = append(newGroup.Versions, groupVer)
+			}
+		}
+
+		groupList = append(groupList, newGroup)
+	}
+
+	return &metav1.APIGroupList{
+		Groups: groupList,
+	}, nil
+}
+
+func (c *FakeDiscovery) ServerVersion() (*version.Info, error) {
+	action := testing.ActionImpl{}
+	action.Verb = "get"
+	action.Resource = schema.GroupVersionResource{Resource: "version"}
+
+	c.Invokes(action, nil)
+	versionInfo := kubeversion.Get()
+	return &versionInfo, nil
+}
+
+func (c *FakeDiscovery) SwaggerSchema(version schema.GroupVersion) (*swagger.ApiDeclaration, error) {
+	action := testing.ActionImpl{}
+	action.Verb = "get"
+	if version == v1.SchemeGroupVersion {
+		action.Resource = schema.GroupVersionResource{Resource: "/swaggerapi/api/" + version.Version}
+	} else {
+		action.Resource = schema.GroupVersionResource{Resource: "/swaggerapi/apis/" + version.Group + "/" + version.Version}
+	}
+
+	c.Invokes(action, nil)
+	return &swagger.ApiDeclaration{}, nil
+}
+
+func (c *FakeDiscovery) OpenAPISchema() (*openapi_v2.Document, error) {
+	return &openapi_v2.Document{}, nil
+}
+
+func (c *FakeDiscovery) RESTClient() restclient.Interface {
+	return nil
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/dynamicmapper/mapper.go

@@ -0,0 +1,113 @@
+package dynamicmapper
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/golang/glog"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/client-go/discovery"
+	"k8s.io/client-go/restmapper"
+)
+
+// RengeneratingDiscoveryRESTMapper is a RESTMapper which Regenerates its cache of mappings periodically.
+// It functions by recreating a normal discovery RESTMapper at the specified interval.
+// We don't refresh automatically on cache misses, since we get called on every label, plenty of which will
+// be unrelated to Kubernetes resources.
+type RegeneratingDiscoveryRESTMapper struct {
+	discoveryClient discovery.DiscoveryInterface
+
+	refreshInterval time.Duration
+
+	mu sync.RWMutex
+
+	delegate meta.RESTMapper
+}
+
+func NewRESTMapper(discoveryClient discovery.DiscoveryInterface, refreshInterval time.Duration) (*RegeneratingDiscoveryRESTMapper, error) {
+	mapper := &RegeneratingDiscoveryRESTMapper{
+		discoveryClient: discoveryClient,
+		refreshInterval: refreshInterval,
+	}
+	if err := mapper.RegenerateMappings(); err != nil {
+		return nil, fmt.Errorf("unable to populate initial set of REST mappings: %v", err)
+	}
+
+	return mapper, nil
+}
+
+// RunUtil runs the mapping refresher until the given stop channel is closed.
+func (m *RegeneratingDiscoveryRESTMapper) RunUntil(stop <-chan struct{}) {
+	go wait.Until(func() {
+		if err := m.RegenerateMappings(); err != nil {
+			glog.Errorf("error regenerating REST mappings from discovery: %v", err)
+		}
+	}, m.refreshInterval, stop)
+}
+
+func (m *RegeneratingDiscoveryRESTMapper) RegenerateMappings() error {
+	resources, err := restmapper.GetAPIGroupResources(m.discoveryClient)
+	if err != nil {
+		return err
+	}
+	newDelegate := restmapper.NewDiscoveryRESTMapper(resources)
+
+	// don't lock until we're ready to replace
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.delegate = newDelegate
+
+	return nil
+}
+
+func (m *RegeneratingDiscoveryRESTMapper) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	return m.delegate.KindFor(resource)
+}
+
+func (m *RegeneratingDiscoveryRESTMapper) KindsFor(resource schema.GroupVersionResource) ([]schema.GroupVersionKind, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	return m.delegate.KindsFor(resource)
+
+}
+func (m *RegeneratingDiscoveryRESTMapper) ResourceFor(input schema.GroupVersionResource) (schema.GroupVersionResource, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	return m.delegate.ResourceFor(input)
+
+}
+func (m *RegeneratingDiscoveryRESTMapper) ResourcesFor(input schema.GroupVersionResource) ([]schema.GroupVersionResource, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	return m.delegate.ResourcesFor(input)
+
+}
+func (m *RegeneratingDiscoveryRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*meta.RESTMapping, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	return m.delegate.RESTMapping(gk, versions...)
+
+}
+func (m *RegeneratingDiscoveryRESTMapper) RESTMappings(gk schema.GroupKind, versions ...string) ([]*meta.RESTMapping, error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	return m.delegate.RESTMappings(gk, versions...)
+}
+func (m *RegeneratingDiscoveryRESTMapper) ResourceSingularizer(resource string) (singular string, err error) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	return m.delegate.ResourceSingularizer(resource)
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider/errors.go

@@ -0,0 +1,49 @@
+/*
+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"
+	"net/http"
+
+	apierr "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+// NewMetricNotFoundError returns a StatusError indicating the given metric could not be found.
+// It is similar to NewNotFound, but more specialized
+func NewMetricNotFoundError(resource schema.GroupResource, metricName string) *apierr.StatusError {
+	return &apierr.StatusError{metav1.Status{
+		Status:  metav1.StatusFailure,
+		Code:    int32(http.StatusNotFound),
+		Reason:  metav1.StatusReasonNotFound,
+		Message: fmt.Sprintf("the server could not find the metric %s for %s", metricName, resource.String()),
+	}}
+}
+
+// NewMetricNotFoundForError returns a StatusError indicating the given metric could not be found for
+// the given named object. It is similar to NewNotFound, but more specialized
+func NewMetricNotFoundForError(resource schema.GroupResource, metricName string, resourceName string) *apierr.StatusError {
+	return &apierr.StatusError{metav1.Status{
+		Status:  metav1.StatusFailure,
+		Code:    int32(http.StatusNotFound),
+		Reason:  metav1.StatusReasonNotFound,
+		Message: fmt.Sprintf("the server could not find the metric %s for %s %s", metricName, resource.String(), resourceName),
+	}}
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider/interfaces.go

@@ -0,0 +1,119 @@
+/*
+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"
+
+	apimeta "k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/metrics/pkg/apis/custom_metrics"
+	"k8s.io/metrics/pkg/apis/external_metrics"
+)
+
+// CustomMetricInfo describes a metric for a particular
+// fully-qualified group resource.
+type CustomMetricInfo struct {
+	GroupResource schema.GroupResource
+	Namespaced    bool
+	Metric        string
+}
+
+// ExternalMetricInfo describes a metric.
+type ExternalMetricInfo struct {
+	Metric string
+	Labels map[string]string
+}
+
+func (i CustomMetricInfo) String() string {
+	if i.Namespaced {
+		return fmt.Sprintf("%s/%s(namespaced)", i.GroupResource.String(), i.Metric)
+	} else {
+		return fmt.Sprintf("%s/%s", i.GroupResource.String(), i.Metric)
+	}
+}
+
+// Normalized returns a copy of the current MetricInfo with the GroupResource resolved using the
+// provided REST mapper, to ensure consistent pluralization, etc, for use when looking up or comparing
+// the MetricInfo.  It also returns the singular form of the GroupResource associated with the given
+// MetricInfo.
+func (i CustomMetricInfo) Normalized(mapper apimeta.RESTMapper) (normalizedInfo CustomMetricInfo, singluarResource string, err error) {
+	normalizedGroupRes, err := mapper.ResourceFor(i.GroupResource.WithVersion(""))
+	if err != nil {
+		return i, "", err
+	}
+	i.GroupResource = normalizedGroupRes.GroupResource()
+
+	singularResource, err := mapper.ResourceSingularizer(i.GroupResource.Resource)
+	if err != nil {
+		return i, "", err
+	}
+
+	return i, singularResource, nil
+}
+
+// CustomMetricsProvider is a source of custom metrics
+// which is able to supply a list of available metrics,
+// as well as metric values themselves on demand.
+//
+// Note that group-resources are provided  as GroupResources,
+// not GroupKinds.  This is to allow flexibility on the part
+// of the implementor: implementors do not necessarily need
+// to be aware of all existing kinds and their corresponding
+// REST mappings in order to perform queries.
+//
+// For queries that use label selectors, it is up to the
+// implementor to decide how to make use of the label selector --
+// they may wish to query the main Kubernetes API server, or may
+// wish to simply make use of stored information in their TSDB.
+type CustomMetricsProvider interface {
+	// GetRootScopedMetricByName fetches a particular metric for a particular root-scoped object.
+	GetRootScopedMetricByName(groupResource schema.GroupResource, name string, metricName string) (*custom_metrics.MetricValue, error)
+
+	// GetRootScopedMetricByName fetches a particular metric for a set of root-scoped objects
+	// matching the given label selector.
+	GetRootScopedMetricBySelector(groupResource schema.GroupResource, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error)
+
+	// GetNamespacedMetricByName fetches a particular metric for a particular namespaced object.
+	GetNamespacedMetricByName(groupResource schema.GroupResource, namespace string, name string, metricName string) (*custom_metrics.MetricValue, error)
+
+	// GetNamespacedMetricByName fetches a particular metric for a set of namespaced objects
+	// matching the given label selector.
+	GetNamespacedMetricBySelector(groupResource schema.GroupResource, namespace string, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error)
+
+	// ListAllMetrics provides a list of all available metrics at
+	// the current time.  Note that this is not allowed to return
+	// an error, so it is reccomended that implementors cache and
+	// periodically update this list, instead of querying every time.
+	ListAllMetrics() []CustomMetricInfo
+}
+
+// ExternalMetricsProvider is a source of external metrics.
+// Metric is normally idendified by a name and a set of labels/tags. It is up to a specific
+// implementation how to translate metricSelector to a filter for metric values.
+// Namespace can be used by the implemetation for metric identification, access control or ignored.
+type ExternalMetricsProvider interface {
+	GetExternalMetric(namespace string, metricName string, metricSelector labels.Selector) (*external_metrics.ExternalMetricValueList, error)
+
+	ListAllExternalMetrics() []ExternalMetricInfo
+}
+
+type MetricsProvider interface {
+	CustomMetricsProvider
+	ExternalMetricsProvider
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider/resource_lister.go

@@ -0,0 +1,77 @@
+/*
+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 (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apiserver/pkg/endpoints/discovery"
+)
+
+type customMetricsResourceLister struct {
+	provider CustomMetricsProvider
+}
+
+type externalMetricsResourceLister struct {
+	provider ExternalMetricsProvider
+}
+
+// NewCustomMetricResourceLister creates APIResourceLister for provided CustomMetricsProvider.
+func NewCustomMetricResourceLister(provider CustomMetricsProvider) discovery.APIResourceLister {
+	return &customMetricsResourceLister{
+		provider: provider,
+	}
+}
+
+func (l *customMetricsResourceLister) ListAPIResources() []metav1.APIResource {
+	metrics := l.provider.ListAllMetrics()
+	resources := make([]metav1.APIResource, len(metrics))
+
+	for i, metric := range metrics {
+		resources[i] = metav1.APIResource{
+			Name:       metric.GroupResource.String() + "/" + metric.Metric,
+			Namespaced: metric.Namespaced,
+			Kind:       "MetricValueList",
+			Verbs:      metav1.Verbs{"get"}, // TODO: support "watch"
+		}
+	}
+
+	return resources
+}
+
+// NewExternalMetricResourceLister creates APIResourceLister for provided CustomMetricsProvider.
+func NewExternalMetricResourceLister(provider ExternalMetricsProvider) discovery.APIResourceLister {
+	return &externalMetricsResourceLister{
+		provider: provider,
+	}
+}
+
+// ListAPIResources lists all supported custom metrics.
+func (l *externalMetricsResourceLister) ListAPIResources() []metav1.APIResource {
+	metrics := l.provider.ListAllExternalMetrics()
+	resources := make([]metav1.APIResource, len(metrics))
+
+	for i, metric := range metrics {
+		resources[i] = metav1.APIResource{
+			Name:       metric.Metric,
+			Namespaced: true,
+			Kind:       "ExternalMetricValueList",
+			Verbs:      metav1.Verbs{"get"},
+		}
+	}
+
+	return resources
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/registry/custom_metrics/reststorage.go

@@ -0,0 +1,129 @@
+/*
+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 apiserver
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
+	metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apiserver/pkg/endpoints/request"
+	genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
+	"k8s.io/apiserver/pkg/registry/rest"
+	"k8s.io/metrics/pkg/apis/custom_metrics"
+)
+
+type REST struct {
+	cmProvider provider.CustomMetricsProvider
+}
+
+var _ rest.Storage = &REST{}
+var _ rest.Lister = &REST{}
+
+func NewREST(cmProvider provider.CustomMetricsProvider) *REST {
+	return &REST{
+		cmProvider: cmProvider,
+	}
+}
+
+// Implement Storage
+
+func (r *REST) New() runtime.Object {
+	return &custom_metrics.MetricValue{}
+}
+
+// Implement Lister
+
+func (r *REST) NewList() runtime.Object {
+	return &custom_metrics.MetricValueList{}
+}
+
+func (r *REST) List(ctx context.Context, options *metainternalversion.ListOptions) (runtime.Object, error) {
+	// populate the label selector, defaulting to all
+	selector := labels.Everything()
+	if options != nil && options.LabelSelector != nil {
+		selector = options.LabelSelector
+	}
+
+	// grab the name, if present, from the field selector list options
+	// (this is how the list handler logic injects it)
+	// (otherwise we'd have to write a custom list handler)
+	name := "*"
+	if options != nil && options.FieldSelector != nil {
+		if nameMatch, required := options.FieldSelector.RequiresExactMatch("metadata.name"); required {
+			name = nameMatch
+		}
+	}
+
+	namespace := genericapirequest.NamespaceValue(ctx)
+
+	requestInfo, ok := request.RequestInfoFrom(ctx)
+	if !ok {
+		return nil, fmt.Errorf("unable to get resource and metric name from request")
+	}
+
+	resourceRaw := requestInfo.Resource
+	metricName := requestInfo.Subresource
+
+	groupResource := schema.ParseGroupResource(resourceRaw)
+
+	// handle metrics describing namespaces
+	if namespace != "" && resourceRaw == "metrics" {
+		// namespace-describing metrics have a path of /namespaces/$NS/metrics/$metric,
+		groupResource = schema.GroupResource{Resource: "namespaces"}
+		metricName = name
+		name = namespace
+		namespace = ""
+	}
+
+	// handle namespaced and root metrics
+	if name == "*" {
+		return r.handleWildcardOp(namespace, groupResource, selector, metricName)
+	} else {
+		return r.handleIndividualOp(namespace, groupResource, name, metricName)
+	}
+}
+
+func (r *REST) handleIndividualOp(namespace string, groupResource schema.GroupResource, name string, metricName string) (*custom_metrics.MetricValueList, error) {
+	var err error
+	var singleRes *custom_metrics.MetricValue
+	if namespace == "" {
+		singleRes, err = r.cmProvider.GetRootScopedMetricByName(groupResource, name, metricName)
+	} else {
+		singleRes, err = r.cmProvider.GetNamespacedMetricByName(groupResource, namespace, name, metricName)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &custom_metrics.MetricValueList{
+		Items: []custom_metrics.MetricValue{*singleRes},
+	}, nil
+}
+
+func (r *REST) handleWildcardOp(namespace string, groupResource schema.GroupResource, selector labels.Selector, metricName string) (*custom_metrics.MetricValueList, error) {
+	if namespace == "" {
+		return r.cmProvider.GetRootScopedMetricBySelector(groupResource, selector, metricName)
+	} else {
+		return r.cmProvider.GetNamespacedMetricBySelector(groupResource, namespace, selector, metricName)
+	}
+}

vendor/github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/registry/external_metrics/reststorage.go

@@ -0,0 +1,80 @@
+/*
+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 apiserver
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/kubernetes-incubator/custom-metrics-apiserver/pkg/provider"
+	metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apiserver/pkg/endpoints/request"
+	genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
+	"k8s.io/apiserver/pkg/registry/rest"
+	"k8s.io/metrics/pkg/apis/external_metrics"
+)
+
+// REST is a wrapper for CustomMetricsProvider that provides implementation for Storage and Lister
+// interfaces.
+type REST struct {
+	emProvider provider.ExternalMetricsProvider
+}
+
+var _ rest.Storage = &REST{}
+var _ rest.Lister = &REST{}
+
+// NewREST returns new REST object for provided CustomMetricsProvider.
+func NewREST(emProvider provider.ExternalMetricsProvider) *REST {
+	return &REST{
+		emProvider: emProvider,
+	}
+}
+
+// Implement Storage
+
+// New returns empty MetricValue.
+func (r *REST) New() runtime.Object {
+	return &external_metrics.ExternalMetricValue{}
+}
+
+// Implement Lister
+
+// NewList returns empty MetricValueList.
+func (r *REST) NewList() runtime.Object {
+	return &external_metrics.ExternalMetricValueList{}
+}
+
+// List selects resources in the storage which match to the selector.
+func (r *REST) List(ctx context.Context, options *metainternalversion.ListOptions) (runtime.Object, error) {
+	// populate the label selector, defaulting to all
+	metricSelector := labels.Everything()
+	if options != nil && options.LabelSelector != nil {
+		metricSelector = options.LabelSelector
+	}
+
+	namespace := genericapirequest.NamespaceValue(ctx)
+
+	requestInfo, ok := request.RequestInfoFrom(ctx)
+	if !ok {
+		return nil, fmt.Errorf("unable to get resource and metric name from request")
+	}
+	metricName := requestInfo.Resource
+
+	return r.emProvider.GetExternalMetric(namespace, metricName, metricSelector)
+}