Merge pull request #187 from prometheus/fix/goroutine-leak

Have goroutine exit on signal via defer block.

storage/metric/tiered.go

@@ -164,14 +164,12 @@ func (t *tieredStorage) Serve() {
 	var (
 		flushMemoryTicker = time.Tick(t.flushMemoryInterval)
 		writeMemoryTicker = time.Tick(t.writeMemoryInterval)
+		reportTicker      = time.NewTicker(time.Second)
 	)
+	defer reportTicker.Stop()
 
 	go func() {
-		reportTicker := time.Tick(time.Second)
-
-		for {
-			<-reportTicker
-
+		for _ = range reportTicker.C {
 			t.reportQueues()
 		}
 	}()

storage/metric/tiered_test.go

@@ -508,7 +508,6 @@ func TestGetAllValuesForLabel(t *testing.T) {
 
 	for i, scenario := range scenarios {
 		tiered, closer := newTestTieredStorage(t)
-		defer closer.Close()
 		for j, metric := range scenario.in {
 			sample := model.Sample{
 				Metric: model.Metric{model.MetricNameLabel: model.LabelValue(metric.metricName)},
@@ -525,6 +524,7 @@ func TestGetAllValuesForLabel(t *testing.T) {
 			}
 		}
 		metricNames, err := tiered.GetAllValuesForLabel(model.MetricNameLabel)
+		closer.Close()
 		if err != nil {
 			t.Fatalf("%d. Error getting metric names: %s", i, err)
 		}