stats: fix missing computation of transferQueueSize when summing up statistics group - fixes #5749

fs/accounting/stats_groups.go

@@ -373,6 +373,7 @@ func (sg *statsGroups) sum(ctx context.Context) *StatsInfo {
 				sum.lastError = stats.lastError
 			}
 			sum.startedTransfers = append(sum.startedTransfers, stats.startedTransfers...)
+			sum.transferQueueSize += stats.transferQueueSize
 			sum.oldDuration += stats.oldDuration
 			sum.oldTimeRanges = append(sum.oldTimeRanges, stats.oldTimeRanges...)
 			stats.average.mu.Lock()

fs/accounting/stats_groups_test.go

@@ -47,12 +47,14 @@ func TestStatsGroupOperations(t *testing.T) {
 		t.Parallel()
 		stats1 := NewStats(ctx)
 		stats1.bytes = 5
+		stats1.transferQueueSize = 10
 		stats1.errors = 6
 		stats1.oldDuration = time.Second
 		stats1.oldTimeRanges = []timeRange{{time.Now(), time.Now().Add(time.Second)}}
 		stats2 := NewStats(ctx)
 		stats2.bytes = 10
 		stats2.errors = 12
+		stats1.transferQueueSize = 20
 		stats2.oldDuration = 2 * time.Second
 		stats2.oldTimeRanges = []timeRange{{time.Now(), time.Now().Add(2 * time.Second)}}
 		sg := newStatsGroups()
@@ -60,6 +62,7 @@ func TestStatsGroupOperations(t *testing.T) {
 		sg.set(ctx, "test2", stats2)
 		sum := sg.sum(ctx)
 		assert.Equal(t, stats1.bytes+stats2.bytes, sum.bytes)
+		assert.Equal(t, stats1.transferQueueSize+stats2.transferQueueSize, sum.transferQueueSize)
 		assert.Equal(t, stats1.errors+stats2.errors, sum.errors)
 		assert.Equal(t, stats1.oldDuration+stats2.oldDuration, sum.oldDuration)
 		assert.Equal(t, stats1.average.speed+stats2.average.speed, sum.average.speed)