[FEAT] Clean code

pkg/shipper/shipper.go

@@ -66,7 +66,7 @@ func newMetrics(reg prometheus.Registerer) *metrics {
 	})
 	m.uploadedBytes = promauto.With(reg).NewCounter(prometheus.CounterOpts{
 		Name: "thanos_shipper_uploaded_bytes_total",
-		Help: "Total number of uploaded bytes.",
+		Help: "Total number of uploaded bytes from TSDB blocks.",
 	})
 
 	return &m
@@ -391,19 +391,17 @@ func (s *Shipper) upload(ctx context.Context, meta *metadata.Meta) error {
 	}
 
 	err := block.Upload(ctx, s.logger, s.bucket, updir, s.hashFunc)
-
 	if err != nil {
 		return errors.Wrap(err, "while upploading the block")
 	}
 
-	files, err := block.GatherFileStats(updir, s.hashFunc, s.logger)
-
+	fileStats, err := block.GatherFileStats(updir, s.hashFunc, s.logger)
 	if err != nil {
-		//The block upload should not stop due to issues gathering data for a metric
+		// The block upload should not stop due to issues gathering data for a metric.
 		return nil
 	}
 
-	for _, x := range files {
+	for _, x := range fileStats {
 		s.metrics.uploadedBytes.Add(float64(x.SizeBytes))
 	}