alerting: supports extracting alerts from collapsed panels

collapsed rows wrap the hidden rows within itself. This caused
the extractor to miss the panel and therefore delete the alert
accosiated with the graph.

closes grafana#11222

(cherry picked from commit be7ec31)

pkg/services/alerting/extractor.go

@@ -74,6 +74,21 @@ func (e *DashAlertExtractor) GetAlertFromPanels(jsonWithPanels *simplejson.Json)
 
 	for _, panelObj := range jsonWithPanels.Get("panels").MustArray() {
 		panel := simplejson.NewFromAny(panelObj)
+
+		collapsedJson, collapsed := panel.CheckGet("collapsed")
+		// check if the panel is collapsed
+		if collapsed && collapsedJson.MustBool() {
+
+			// extract alerts from sub panels for collapsed panels
+			als, err := e.GetAlertFromPanels(panel)
+			if err != nil {
+				return nil, err
+			}
+
+			alerts = append(alerts, als...)
+			continue
+		}
+
 		jsonAlert, hasAlert := panel.CheckGet("alert")
 
 		if !hasAlert {

pkg/services/alerting/extractor_test.go

@@ -22,6 +22,7 @@ func TestAlertRuleExtraction(t *testing.T) {
 		defaultDs := &m.DataSource{Id: 12, OrgId: 1, Name: "I am default", IsDefault: true}
 		graphite2Ds := &m.DataSource{Id: 15, OrgId: 1, Name: "graphite2"}
 		influxDBDs := &m.DataSource{Id: 16, OrgId: 1, Name: "InfluxDB"}
+		prom := &m.DataSource{Id: 17, OrgId: 1, Name: "Prometheus"}
 
 		bus.AddHandler("test", func(query *m.GetDataSourcesQuery) error {
 			query.Result = []*m.DataSource{defaultDs, graphite2Ds}
@@ -38,6 +39,10 @@ func TestAlertRuleExtraction(t *testing.T) {
 			if query.Name == influxDBDs.Name {
 				query.Result = influxDBDs
 			}
+			if query.Name == prom.Name {
+				query.Result = prom
+			}
+
 			return nil
 		})
 
@@ -214,5 +219,26 @@ func TestAlertRuleExtraction(t *testing.T) {
 				}
 			})
 		})
+
+		Convey("Should be able to extract collapsed panels", func() {
+			json, err := ioutil.ReadFile("./test-data/collapsed-panels.json")
+			So(err, ShouldBeNil)
+
+			dashJson, err := simplejson.NewJson(json)
+			So(err, ShouldBeNil)
+
+			dash := m.NewDashboardFromJson(dashJson)
+			extractor := NewDashAlertExtractor(dash, 1)
+
+			alerts, err := extractor.GetAlerts()
+
+			Convey("Get rules without error", func() {
+				So(err, ShouldBeNil)
+			})
+
+			Convey("should be able to extract collapsed alerts", func() {
+				So(len(alerts), ShouldEqual, 4)
+			})
+		})
 	})
 }