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68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
/*
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Copyright 2015 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 provides utilities for registering client metrics to Prometheus.
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package metrics
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import (
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"sync"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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)
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const restClientSubsystem = "rest_client"
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var (
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// RequestLatency is a Prometheus Summary metric type partitioned by
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// "verb" and "url" labels. It is used for the rest client latency metrics.
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RequestLatency = prometheus.NewSummaryVec(
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prometheus.SummaryOpts{
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Subsystem: restClientSubsystem,
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Name: "request_latency_microseconds",
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Help: "Request latency in microseconds. Broken down by verb and URL",
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MaxAge: time.Hour,
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},
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[]string{"verb", "url"},
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)
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RequestResult = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Subsystem: restClientSubsystem,
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Name: "request_status_codes",
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Help: "Number of http requests, partitioned by metadata",
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},
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[]string{"code", "method", "host"},
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)
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)
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var registerMetrics sync.Once
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// Register registers all metrics to Prometheus with
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// respect to the RequestLatency.
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func Register() {
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// Register the metrics.
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registerMetrics.Do(func() {
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prometheus.MustRegister(RequestLatency)
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prometheus.MustRegister(RequestResult)
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})
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}
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// Calculates the time since the specified start in microseconds.
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func SinceInMicroseconds(start time.Time) float64 {
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return float64(time.Since(start).Nanoseconds() / time.Microsecond.Nanoseconds())
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}
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