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main.go
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// Copyright OpenTelemetry Authors
// Copyright Splunk, Inc.
//
// 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.
package main
import (
"context"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/metric/prometheus"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/metric/global"
"go.uber.org/zap"
)
func initMeter() {
exporter, err := prometheus.InstallNewPipeline(prometheus.Config{})
if err != nil {
log.Panicf("failed to initialize prometheus exporter %v", err)
}
mux := http.NewServeMux()
mux.HandleFunc("/", exporter.ServeHTTP)
server := &http.Server{
ReadHeaderTimeout: 5 * time.Second,
Handler: mux,
Addr: ":8080",
}
go server.ListenAndServe()
}
func main() {
// set up prometheus
initMeter()
// logging
logger, _ := zap.NewProduction()
defer logger.Sync()
logger.Info("Start Prometheus metrics app")
meter := global.Meter("counter")
valueRecorder := metric.Must(meter).NewInt64ValueRecorder("prom_counter")
ctx := context.Background()
valueRecorder.Measurement(0)
commonLabels := []attribute.KeyValue{attribute.String("A", "1"), attribute.String("B", "2"), attribute.String("C", "3")}
counter := int64(0)
meter.RecordBatch(ctx,
commonLabels,
valueRecorder.Measurement(counter))
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT)
ticker := time.NewTicker(1 * time.Second)
for {
select {
case <-ticker.C:
counter++
meter.RecordBatch(ctx,
commonLabels,
valueRecorder.Measurement(counter))
break
case <-c:
ticker.Stop()
logger.Info("Stop Prometheus metrics app")
return
}
}
}