Only register fetched_bytes metrics for Get/GetRange

The other operations are not exposing the fetched bytes.

Signed-off-by: Christian Simon <[email protected]>

objstore.go

@@ -448,6 +448,11 @@ func WrapWithMetrics(b Bucket, reg prometheus.Registerer, name string) *metricBu
 		bkt.ops.WithLabelValues(op)
 		bkt.opsFailures.WithLabelValues(op)
 		bkt.opsDuration.WithLabelValues(op)
+	}
+	for _, op := range []string{
+		OpGet,
+		OpGetRange,
+	} {
 		bkt.opsFetchedBytes.WithLabelValues(op)
 	}
 	bkt.lastSuccessfulUploadTime.WithLabelValues(b.Name())

objstore_test.go

@@ -112,13 +112,8 @@ func TestDownloadUploadDirConcurrency(t *testing.T) {
 	testutil.Ok(t, promtest.GatherAndCompare(r, strings.NewReader(`
 		# HELP objstore_bucket_operation_fetched_bytes_total Total number of bytes fetched from bucket, per operation.
         # TYPE objstore_bucket_operation_fetched_bytes_total counter
-        objstore_bucket_operation_fetched_bytes_total{bucket="",operation="attributes"} 0
-        objstore_bucket_operation_fetched_bytes_total{bucket="",operation="delete"} 0
-        objstore_bucket_operation_fetched_bytes_total{bucket="",operation="exists"} 0
         objstore_bucket_operation_fetched_bytes_total{bucket="",operation="get"} 3
         objstore_bucket_operation_fetched_bytes_total{bucket="",operation="get_range"} 0
-        objstore_bucket_operation_fetched_bytes_total{bucket="",operation="iter"} 0
-        objstore_bucket_operation_fetched_bytes_total{bucket="",operation="upload"} 0
 		`), `objstore_bucket_operation_fetched_bytes_total`))
 
 	testutil.Ok(t, UploadDir(context.Background(), log.NewNopLogger(), m, tempDir, "/dir-copy", WithUploadConcurrency(10)))