72 lines
2.1 KiB
Go
72 lines
2.1 KiB
Go
// Copyright 2022 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// A simple example of how to record a latency metric with exemplars, using a fictional id
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// as a prometheus label.
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package main
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import (
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"fmt"
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"log"
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"math/rand"
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"net/http"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/collectors"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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func main() {
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requestDurations := prometheus.NewHistogram(prometheus.HistogramOpts{
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Name: "http_request_duration_seconds",
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Help: "A histogram of the HTTP request durations in seconds.",
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Buckets: prometheus.ExponentialBuckets(0.1, 1.5, 5),
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})
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// Create non-global registry.
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registry := prometheus.NewRegistry()
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// Add go runtime metrics and process collectors.
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registry.MustRegister(
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collectors.NewGoCollector(),
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collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
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requestDurations,
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)
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go func() {
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for {
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// Record fictional latency.
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now := time.Now()
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requestDurations.(prometheus.ExemplarObserver).ObserveWithExemplar(
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time.Since(now).Seconds(), prometheus.Labels{"dummyID": fmt.Sprint(rand.Intn(100000))},
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)
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time.Sleep(600 * time.Millisecond)
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}
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}()
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// Expose /metrics HTTP endpoint using the created custom registry.
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http.Handle(
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"/metrics", promhttp.HandlerFor(
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registry,
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promhttp.HandlerOpts{
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OpenMetricsOptions: promhttp.OpenMetricsOptions{
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Enable: true,
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},
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}),
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)
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// To test: curl -H 'Accept: application/openmetrics-text' localhost:8080/metrics
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log.Fatalln(http.ListenAndServe(":8080", nil))
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}
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