63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
package main
|
|
|
|
import (
|
|
"log"
|
|
"net/http"
|
|
"os"
|
|
"os/signal"
|
|
"sync/atomic"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
)
|
|
|
|
var (
|
|
counter = prometheus.NewCounterVec(
|
|
prometheus.CounterOpts{
|
|
Name: "custom_counter_total",
|
|
Help: "A counter that increments every 30 seconds",
|
|
},
|
|
[]string{},
|
|
)
|
|
counterValue uint64
|
|
)
|
|
|
|
func main() {
|
|
// Register Prometheus metrics
|
|
prometheus.MustRegister(counter)
|
|
|
|
// Start background counter incrementer
|
|
go incrementCounterEvery30s()
|
|
|
|
// Set up HTTP server
|
|
http.Handle("/metrics", promhttp.Handler())
|
|
server := &http.Server{Addr: ":8080"}
|
|
|
|
// Handle graceful shutdown
|
|
stop := make(chan os.Signal, 1)
|
|
signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
|
|
|
|
go func() {
|
|
log.Println("Starting server on :8080")
|
|
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
|
|
log.Fatalf("Server error: %v", err)
|
|
}
|
|
}()
|
|
|
|
<-stop
|
|
log.Println("\nShutting down server...")
|
|
}
|
|
|
|
func incrementCounterEvery30s() {
|
|
ticker := time.NewTicker(30 * time.Second)
|
|
defer ticker.Stop()
|
|
|
|
for range ticker.C {
|
|
newVal := atomic.AddUint64(&counterValue, 1)
|
|
counter.WithLabelValues().Add(1)
|
|
log.Printf("Counter incremented to %d", newVal)
|
|
}
|
|
}
|