embed: serve health, serve insecure with metrics handler

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

embed/etcd.go

@@ -426,12 +426,16 @@ func (e *Etcd) serve() (err error) {
 	}
 
 	if len(e.cfg.ListenMetricsUrls) > 0 {
-		// TODO: maybe etcdhttp.MetricsPath or get the path from the user-provided URL
+		// serve health, metrics information together
 		metricsMux := http.NewServeMux()
-		metrics.RegisterPrometheus(metricsMux)
+		metricsMux.Handle(metrics.PathMetrics, metrics.Handler(e.Server))
 
 		for _, murl := range e.cfg.ListenMetricsUrls {
-			ml, err := transport.NewListener(murl.Host, murl.Scheme, &e.cfg.ClientTLSInfo)
+			tlsInfo := &e.cfg.ClientTLSInfo
+			if murl.Scheme == "http" {
+				tlsInfo = nil
+			}
+			ml, err := transport.NewListener(murl.Host, murl.Scheme, tlsInfo)
 			if err != nil {
 				return err
 			}