Don't update metrics on context cancellation

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>

storage/remote/queue_manager.go

@@ -15,6 +15,7 @@ package remote
 
 import (
 	"context"
+	"errors"
 	"math"
 	"strconv"
 	"sync"
@@ -1311,6 +1312,11 @@ func (s *shards) sendSamplesWithBackoff(ctx context.Context, samples []prompb.Ti
 	}
 
 	err = sendWriteRequestWithBackoff(ctx, s.qm.cfg, s.qm.logger, attemptStore, onRetry)
+	if errors.Is(err, context.Canceled) {
+		// When there is resharding, we cancel the context for this queue, which means the data is not sent.
+		// So we exit early to not update the metrics.
+		return err
+	}
 
 	s.qm.metrics.sentBytesTotal.Add(float64(reqSize))
 	s.qm.metrics.highestSentTimestamp.Set(float64(highest / 1000))