Fix querycoord metrics (#20429)

Signed-off-by: Nlongjiquan <jiquan.long@zilliz.com>
Signed-off-by: Nlongjiquan <jiquan.long@zilliz.com>

internal/querycoordv2/server.go

@@ -296,6 +296,12 @@ func (s *Server) initObserver() {
 	)
 }
 
+func (s *Server) afterStart() {
+	now := time.Now()
+	Params.QueryCoordCfg.CreatedTime = now
+	Params.QueryCoordCfg.UpdatedTime = now
+}
+
 func (s *Server) Start() error {
 	log.Info("start watcher...")
 	sessions, revision, err := s.session.GetSessions(typeutil.QueryNodeRole)
@@ -348,6 +354,8 @@ func (s *Server) Start() error {
 	}
 	log.Info("QueryCoord started")
 
+	s.afterStart()
+
 	return nil
 }