package main
 
 import (
 	"net"
 	"net/http"
 
 	metrics "github.com/docker/go-metrics"

 	"github.com/sirupsen/logrus"

 )
 
 func startMetricsServer(addr string) error {
 	if err := allocateDaemonPort(addr); err != nil {
 		return err
 	}
 	l, err := net.Listen("tcp", addr)
 	if err != nil {
 		return err
 	}
 	mux := http.NewServeMux()
 	mux.Handle("/metrics", metrics.Handler())
 	go func() {
 		if err := http.Serve(l, mux); err != nil {
 			logrus.Errorf("serve metrics api: %s", err)
 		}
 	}()
 	return nil
 }