move more logs to WARN level

Signed-off-by: Juncen Yu <[email protected]>

Author: YuJuncen

br/pkg/backup/client.go

@@ -1061,7 +1061,7 @@ func (bc *Client) findTargetPeer(ctx context.Context, key []byte, isRawKv bool,
 		// better backoff.
 		region, err := bc.mgr.GetPDClient().GetRegion(ctx, key)
 		if err != nil || region == nil {
-			logutil.CL(ctx).Error("find region failed", zap.Error(err), zap.Reflect("region", region))
+			logutil.CL(ctx).Warn("find region failed", zap.Error(err), zap.Reflect("region", region))
 			time.Sleep(time.Millisecond * time.Duration(mathutil.Min(i*100, 3000)))
 			continue
 		}

br/pkg/checkpoint/checkpoint.go

@@ -374,7 +374,7 @@ func (r *CheckpointRunner[K, V]) startCheckpointFlushLoop(ctx context.Context, w
 func (r *CheckpointRunner[K, V]) sendError(err error) {
 	select {
 	case r.errCh <- err:
-		log.Error("send the error", zap.String("category", "checkpoint"), zap.Error(err))
+		log.Warn("send the error", zap.String("category", "checkpoint"), zap.Error(err))
 		r.errLock.Lock()
 		r.err = err
 		r.errLock.Unlock()