add start metrics server

weed/server/filer_server.go

@@ -54,6 +54,7 @@ type FilerOption struct {
 	recursiveDelete    bool
 	Cipher             bool
 	Filers             []string
+	MetricsHttpPort    int
 }
 
 type FilerServer struct {
@@ -157,6 +158,7 @@ func (fs *FilerServer) maybeStartMetrics() {
 		}
 	}
 
+	go stats.StartMetricsServer(stats.FilerGather, fs.option.MetricsHttpPort)
 	go stats.LoopPushingMetric("filer", stats.SourceName(fs.option.Port), stats.FilerGather, fs.metricsAddress, fs.metricsIntervalSec)
 }