client_golang/examples/gocollector/main.go

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// Copyright 2022 The Prometheus 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.
//go:build go1.17
// +build go1.17
// A minimal example of how to include Prometheus instrumentation.
package main
import (
"flag"
"fmt"
"log"
"net/http"
"regexp"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
func main() {
flag.Parse()
// Create a new registry.
reg := prometheus.NewRegistry()
// Register metrics from GoCollector collecting statistics from the Go Runtime.
// This enabled default, recommended metrics with the additional, recommended metric for
// goroutine scheduling latencies histogram that is currently bit too expensive for default option.
//
// See the related GopherConUK talk to learn more: https://www.youtube.com/watch?v=18dyI_8VFa0
reg.MustRegister(
collectors.NewGoCollector(
collectors.WithGoCollectorRuntimeMetrics(
collectors.GoRuntimeMetricsRule{Matcher: regexp.MustCompile("/sched/latencies:seconds")},
),
),
)
// Expose the registered metrics via HTTP.
http.Handle("/metrics", promhttp.HandlerFor(
reg,
promhttp.HandlerOpts{
// Opt into OpenMetrics to support exemplars.
EnableOpenMetrics: true,
},
))
fmt.Println("Hello world from new Go Collector!")
log.Fatal(http.ListenAndServe(*addr, nil))
}