golang-prometheus-register-wide-labels

main.go

package main

import (
	"github.com/prometheus/client_golang/prometheus"
	"log"
	"net/http"

	"github.com/prometheus/client_golang/prometheus/promhttp"
)

var (
	requestsTotal = prometheus.NewCounter(prometheus.CounterOpts{
		Name: "counter",
		Help: "The total number of requests",
	})
)

func init() {
	prometheus.DefaultRegisterer = prometheus.WrapRegistererWith(prometheus.Labels{"replica": "42"}, prometheus.DefaultRegisterer)
	prometheus.MustRegister(requestsTotal)
}

func main() {
	http.Handle("/metrics", promhttp.Handler())
	log.Println("Listen on localhost:8888")
	log.Fatal(http.ListenAndServe("localhost:8888", nil))
}