Add Close method to activity trackers

Followup to prometheus/prometheus#14064

Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>

Author: krajorama

pkg/querier/engine/query_tracker.go

@@ -67,3 +67,7 @@ func generateActivityDescription(ctx context.Context, query string) string {
 func (q queryTracker) Delete(insertIndex int) {
 	q.tracker.Delete(insertIndex)
 }
+
+func (q *queryTracker) Close() error {
+	return q.tracker.Close()
+}

pkg/streamingpromql/engine_test.go

@@ -1325,6 +1325,10 @@ func (qt *testQueryTracker) Delete(insertIndex int) {
 	qt.queries[insertIndex].deleted = true
 }
 
+func (qt *testQueryTracker) Close() error {
+	return nil
+}
+
 type activeQueryTrackerQueryable struct {
 	tracker *testQueryTracker
 
@@ -1403,6 +1407,10 @@ func (t *timeoutTestingQueryTracker) Delete(_ int) {
 	panic("should not be called")
 }
 
+func (t *timeoutTestingQueryTracker) Close() error {
+	return nil
+}
+
 func TestAnnotations(t *testing.T) {
 	startT := timestamp.Time(0).Add(time.Minute)
 	step := time.Minute