only send metrics address during on the first response

weed/server/master_grpc_server.go

@@ -76,7 +76,9 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 				int64(heartbeat.MaxVolumeCount))
 			glog.V(0).Infof("added volume server %v:%d", heartbeat.GetIp(), heartbeat.GetPort())
 			if err := stream.Send(&master_pb.HeartbeatResponse{
-				VolumeSizeLimit: uint64(ms.option.VolumeSizeLimitMB) * 1024 * 1024,
+				VolumeSizeLimit:        uint64(ms.option.VolumeSizeLimitMB) * 1024 * 1024,
+				MetricsAddress:         ms.option.MetricsAddress,
+				MetricsIntervalSeconds: uint32(ms.option.MetricsIntervalSec),
 			}); err != nil {
 				glog.Warningf("SendHeartbeat.Send volume size to %s:%d %v", dn.Ip, dn.Port, err)
 				return err
@@ -164,9 +166,7 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			return err
 		}
 		if err := stream.Send(&master_pb.HeartbeatResponse{
-			Leader:                 newLeader,
-			MetricsAddress:         ms.option.MetricsAddress,
-			MetricsIntervalSeconds: uint32(ms.option.MetricsIntervalSec),
+			Leader: newLeader,
 		}); err != nil {
 			glog.Warningf("SendHeartbeat.Send response to to %s:%d %v", dn.Ip, dn.Port, err)
 			return err