domain: change some stats log level as WARN (#58316)

ref #58315

Author: hawkingrei

pkg/domain/domain.go

@@ -2597,11 +2597,11 @@ func (do *Domain) loadStatsWorker() {
 		case <-loadTicker.C:
 			err = statsHandle.Update(ctx, do.InfoSchema())
 			if err != nil {
-				logutil.BgLogger().Debug("update stats info failed", zap.Error(err))
+				logutil.BgLogger().Warn("update stats info failed", zap.Error(err))
 			}
 			err = statsHandle.LoadNeededHistograms(do.InfoSchema())
 			if err != nil {
-				logutil.BgLogger().Debug("load histograms failed", zap.Error(err))
+				logutil.BgLogger().Warn("load histograms failed", zap.Error(err))
 			}
 		case <-do.exit:
 			return
@@ -2680,21 +2680,21 @@ func (do *Domain) updateStatsWorker(_ sessionctx.Context) {
 		case <-deltaUpdateTicker.C:
 			err := statsHandle.DumpStatsDeltaToKV(false)
 			if err != nil {
-				logutil.BgLogger().Debug("dump stats delta failed", zap.Error(err))
+				logutil.BgLogger().Warn("dump stats delta failed", zap.Error(err))
 			}
 		case <-gcStatsTicker.C:
 			if !do.statsOwner.IsOwner() {
 				continue
 			}
 			err := statsHandle.GCStats(do.InfoSchema(), do.GetSchemaLease())
 			if err != nil {
-				logutil.BgLogger().Debug("GC stats failed", zap.Error(err))
+				logutil.BgLogger().Warn("GC stats failed", zap.Error(err))
 			}
 			do.CheckAutoAnalyzeWindows()
 		case <-dumpColStatsUsageTicker.C:
 			err := statsHandle.DumpColStatsUsageToKV()
 			if err != nil {
-				logutil.BgLogger().Debug("dump column stats usage failed", zap.Error(err))
+				logutil.BgLogger().Warn("dump column stats usage failed", zap.Error(err))
 			}
 		case <-readMemTicker.C:
 			memory.ForceReadMemStats()