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serve.go
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serve.go
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package metrics
import (
"context"
"errors"
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.uber.org/zap"
)
func serveMetrics(ctx context.Context, logger *zap.Logger, listen string) {
// We don't expect that rendering metrics should take a lot of time and needs long timeout
const timeout = 30 * time.Second
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.HandlerFor(
prometheus.DefaultGatherer,
promhttp.HandlerOpts{
// Opt into OpenMetrics to support exemplars.
EnableOpenMetrics: true,
Timeout: timeout,
},
))
server := &http.Server{
Addr: listen,
Handler: mux,
ReadTimeout: time.Second,
ReadHeaderTimeout: time.Second,
}
go func(ctx context.Context, server *http.Server) {
<-ctx.Done()
if err := server.Shutdown(ctx); err != nil && !errors.Is(err,
http.ErrServerClosed) && !errors.Is(err, context.Canceled) {
logger.Warn("failed to shut down prometheus server", zap.Error(err))
}
}(ctx, server)
err := server.ListenAndServe()
if err != nil && !errors.Is(err, http.ErrServerClosed) {
logger.Warn("failed to start prometheus server", zap.Error(err))
}
}