feat(alerting): shows when no_data triggered alerts

closes #7035
ref #7257

pkg/api/alerting.go

@@ -75,6 +75,7 @@ func GetAlerts(c *middleware.Context) Response {
 			State:          alert.State,
 			NewStateDate:   alert.NewStateDate,
 			ExecutionError: alert.ExecutionError,
+			EvalData:       alert.EvalData,
 		})
 	}
 

pkg/api/dtos/alerting.go

@@ -17,6 +17,7 @@ type AlertRule struct {
 	State          m.AlertStateType `json:"state"`
 	NewStateDate   time.Time        `json:"newStateDate"`
 	EvalDate       time.Time        `json:"evalDate"`
+	EvalData       *simplejson.Json `json:"evalData"`
 	ExecutionError string           `json:"executionError"`
 	DashbboardUri  string           `json:"dashboardUri"`
 }

pkg/services/alerting/result_handler.go

@@ -31,13 +31,17 @@ func (handler *DefaultResultHandler) Handle(evalContext *EvalContext) error {
 	executionError := ""
 	annotationData := simplejson.New()
 
+	if evalContext.Firing {
+		annotationData = simplejson.NewFromAny(evalContext.EvalMatches)
+	}
+
 	if evalContext.Error != nil {
 		executionError = evalContext.Error.Error()
 		annotationData.Set("errorMessage", executionError)
 	}
 
-	if evalContext.Firing {
-		annotationData = simplejson.NewFromAny(evalContext.EvalMatches)
+	if evalContext.NoDataFound {
+		annotationData.Set("no_data", true)
 	}
 
 	countStateResult(evalContext.Rule.State)

pkg/services/sqlstore/alert.go

@@ -113,6 +113,12 @@ func HandleAlertsQuery(query *m.GetAlertsQuery) error {
 		return err
 	}
 
+	for i, _ := range alerts {
+		if alerts[i].ExecutionError == " " {
+			alerts[i].ExecutionError = ""
+		}
+	}
+
 	query.Result = alerts
 	return nil
 }

public/app/features/alerting/alert_list_ctrl.ts

@@ -37,6 +37,9 @@ export class AlertListCtrl {
       this.alerts = _.map(result, alert => {
         alert.stateModel = alertDef.getStateDisplayModel(alert.state);
         alert.newStateDateAgo = moment(alert.newStateDate).fromNow().replace(" ago", "");
+        if (alert.evalData && alert.evalData.no_data) {
+          alert.no_data = true;
+        }
         return alert;
       });
     });

public/app/features/alerting/alert_tab_ctrl.ts

@@ -82,6 +82,15 @@ export class AlertTabCtrl {
         ah.time = moment(ah.time).format('MMM D, YYYY HH:mm:ss');
         ah.stateModel = alertDef.getStateDisplayModel(ah.newState);
         ah.metrics = alertDef.joinEvalMatches(ah.data, ', ');
+
+        if (ah.data.errorMessage) {
+          ah.metrics = "Error: " + ah.data.errorMessage;
+        }
+
+        if (ah.data.no_data) {
+          ah.metrics = "(due to no data)";
+        }
+
         return ah;
       });
     });

public/app/features/alerting/partials/alert_list.html

@@ -52,11 +52,11 @@
               <div class="card-item-sub-name">
                 <span class="alert-list-item-state {{alert.stateModel.stateClass}}">
                   <i class="{{alert.stateModel.iconClass}}"></i>
-                  {{alert.stateModel.text}}
+                  {{alert.stateModel.text}} <span class="small muted" ng-show="alert.no_data">(due to no data)</span>
                 </span> for {{alert.newStateDateAgo}}
               </div>
-              <div class="small muted" ng-show="alert.executionError">
-                {{alert.executionError}}
+              <div class="small muted" ng-show="alert.executionError !== ''">
+                Error: "{{alert.executionError}}"
               </div>
             </div>
           </div>
@@ -64,6 +64,4 @@
       </li>
     </ol>
   </section>
-
 </div>
-