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metrics.go
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metrics.go
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// 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 handler
import (
"strconv"
"time"
"github.com/prometheus/client_golang/prometheus"
)
var (
requestCounter = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "apiserver_request_count",
Help: "Counter of apiserver requests broken out for each verb, API resource, client, and HTTP response contentType and code.",
},
[]string{"verb", "resource", "client", "contentType", "code"},
)
requestLatencies = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "apiserver_request_latencies",
Help: "Response latency distribution in microseconds for each verb, resource and client.",
// Use buckets ranging from 125 ms to 8 seconds.
Buckets: prometheus.ExponentialBuckets(125000, 2.0, 7),
},
[]string{"verb", "resource"},
)
requestLatenciesSummary = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Name: "apiserver_request_latencies_summary",
Help: "Response latency summary in microseconds for each verb and resource.",
// Make the sliding window of 1h.
MaxAge: time.Hour,
},
[]string{"verb", "resource"},
)
)
// Initialize all metrics in prometheus
func init() {
prometheus.MustRegister(requestCounter)
prometheus.MustRegister(requestLatencies)
prometheus.MustRegister(requestLatenciesSummary)
}
// Track API call in prometheus
func monitor(verb, resource string, client, contentType string, httpCode int, reqStart time.Time) {
elapsed := float64((time.Since(reqStart)) / time.Microsecond)
requestCounter.WithLabelValues(verb, resource, client, contentType, strconv.Itoa(httpCode)).Inc()
requestLatencies.WithLabelValues(verb, resource).Observe(elapsed)
requestLatenciesSummary.WithLabelValues(verb, resource).Observe(elapsed)
}