package main import ( "net" "net/http" "github.com/Sirupsen/logrus" metrics "github.com/docker/go-metrics" ) 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 }