domain: move UpdateStatsHealthyMetrics into updateStatsWorker (#55386)

ref #54552

pkg/domain/domain.go

@@ -2444,10 +2444,8 @@ func (do *Domain) loadStatsWorker() {
 		lease = 3 * time.Second
 	}
 	loadTicker := time.NewTicker(lease)
-	updStatsHealthyTicker := time.NewTicker(20 * lease)
 	defer func() {
 		loadTicker.Stop()
-		updStatsHealthyTicker.Stop()
 		logutil.BgLogger().Info("loadStatsWorker exited.")
 	}()
 
@@ -2470,8 +2468,6 @@ func (do *Domain) loadStatsWorker() {
 			if err != nil {
 				logutil.BgLogger().Debug("load histograms failed", zap.Error(err))
 			}
-		case <-updStatsHealthyTicker.C:
-			statsHandle.UpdateStatsHealthyMetrics()
 		case <-do.exit:
 			return
 		}
@@ -2545,13 +2541,15 @@ func (do *Domain) updateStatsWorker(_ sessionctx.Context, owner owner.Manager) {
 	deltaUpdateTicker := time.NewTicker(20*lease + randDuration)
 	gcStatsTicker := time.NewTicker(100 * lease)
 	dumpColStatsUsageTicker := time.NewTicker(100 * lease)
+	updateStatsHealthyTicker := time.NewTicker(20 * lease)
 	readMemTicker := time.NewTicker(memory.ReadMemInterval)
 	statsHandle := do.StatsHandle()
 	defer func() {
 		dumpColStatsUsageTicker.Stop()
 		gcStatsTicker.Stop()
 		deltaUpdateTicker.Stop()
 		readMemTicker.Stop()
+		updateStatsHealthyTicker.Stop()
 		do.SetStatsUpdating(false)
 		logutil.BgLogger().Info("updateStatsWorker exited.")
 	}()
@@ -2581,9 +2579,10 @@ func (do *Domain) updateStatsWorker(_ sessionctx.Context, owner owner.Manager) {
 			if err != nil {
 				logutil.BgLogger().Debug("dump column stats usage failed", zap.Error(err))
 			}
-
 		case <-readMemTicker.C:
 			memory.ForceReadMemStats()
+		case <-updateStatsHealthyTicker.C:
+			statsHandle.UpdateStatsHealthyMetrics()
 		}
 	}
 }