mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
synced 2026-04-05 17:27:51 +00:00
81 lines
2.4 KiB
Go
81 lines
2.4 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"context"
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"net/url"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"k8s.io/component-base/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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"sigs.k8s.io/prometheus-adapter/pkg/client"
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)
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var (
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// queryLatency is the total latency of any query going through the
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// various endpoints (query, range-query, series). It includes some deserialization
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// overhead and HTTP overhead.
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queryLatency = metrics.NewHistogramVec(
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&metrics.HistogramOpts{
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Name: "cmgateway_prometheus_query_latency_seconds",
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Help: "Prometheus client query latency in seconds. Broken down by target prometheus endpoint and target server",
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Buckets: prometheus.ExponentialBuckets(0.01, 2, 10),
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},
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[]string{"endpoint", "server"},
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)
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)
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func init() {
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legacyregistry.MustRegister(queryLatency)
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}
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// instrumentedClient is a client.GenericAPIClient which instruments calls to Do,
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// capturing request latency.
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type instrumentedGenericClient struct {
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serverName string
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client client.GenericAPIClient
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}
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func (c *instrumentedGenericClient) Do(ctx context.Context, verb, endpoint string, query url.Values) (client.APIResponse, error) {
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startTime := time.Now()
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var err error
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defer func() {
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endTime := time.Now()
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// skip calls where we don't make the actual request
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if err != nil {
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if _, wasAPIErr := err.(*client.Error); !wasAPIErr {
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// TODO: measure API errors by code?
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return
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}
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}
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queryLatency.With(prometheus.Labels{"endpoint": endpoint, "server": c.serverName}).Observe(endTime.Sub(startTime).Seconds())
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}()
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var resp client.APIResponse
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resp, err = c.client.Do(ctx, verb, endpoint, query)
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return resp, err
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}
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func InstrumentGenericAPIClient(client client.GenericAPIClient, serverName string) client.GenericAPIClient {
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return &instrumentedGenericClient{
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serverName: serverName,
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client: client,
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}
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}
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