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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.
// A simple example of how to add fixed custom labels to all metrics exported by the origin collector.
// For more details, see the documentation: https://pkg.go.dev/github.com/prometheus/client_golang/prometheus#WrapRegistererWith
package main
import (
"flag"
"log"
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promauto"
"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()
reg.MustRegister(
collectors.NewGoCollector(),
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
)
// We should see the following metrics with an extra source label. But
// other collectors registered above are expected not to have the extra
// label.
// See also https://prometheus.io/docs/instrumenting/writing_exporters/#target-labels-not-static-scraped-labels
startFireKeeper(prometheus.WrapRegistererWith(prometheus.Labels{"component": "FireKeeper"}, reg))
startSparkForge(prometheus.WrapRegistererWith(prometheus.Labels{"component": "SparkForge"}, reg))
http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
log.Fatal(http.ListenAndServe(*addr, nil))
}
func startFireKeeper(reg prometheus.Registerer) {
firesMaintained := promauto.With(reg).NewCounter(prometheus.CounterOpts{
Name: "fires_maintained_total",
Help: "Total number of fires maintained",
})
sparksDistributed := promauto.With(reg).NewCounter(prometheus.CounterOpts{
Name: "sparks_distributed_total",
Help: "Total number of sparks distributed",
})
go func() {
for {
time.Sleep(5 * time.Second)
firesMaintained.Inc()
log.Println("FireKeeper maintained a fire")
}
}()
go func() {
for {
time.Sleep(7 * time.Second)
sparksDistributed.Inc()
log.Println("FireKeeper distributed a spark")
}
}()
}
func startSparkForge(reg prometheus.Registerer) {
itemsForged := promauto.With(reg).NewCounter(prometheus.CounterOpts{
Name: "items_forged_total",
Help: "Total number of items forged",
})
go func() {
for {
time.Sleep(6 * time.Second)
itemsForged.Inc()
log.Println("SparkForge forged an item")
}
}()
}
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