change debug to warn

Signed-off-by: husharp <[email protected]>

Author: HuSharp

tikv/kv.go

@@ -621,7 +621,7 @@ func (s *KVStore) setClusterMinSafeTSByPD(ctx context.Context) bool {
 	if s.pdHttpClient != nil && isGlobal {
 		clusterMinSafeTS, err := s.pdHttpClient.GetClusterMinResolvedTS(ctx)
 		if err != nil {
-			logutil.BgLogger().Debug("get cluster-level min resolved timestamp from PD failed", zap.Error(err))
+			logutil.BgLogger().Warn("get cluster-level min resolved timestamp from PD failed", zap.Error(err))
 		} else if clusterMinSafeTS != 0 {
 			// Update metrics.
 			preClusterMinSafeTS := s.GetMinSafeTS(oracle.GlobalTxnScope)