feat(alerting): add basic UI for history in alert tab

ref #5850

pkg/api/alerting.go

@@ -215,8 +215,13 @@ func DeleteAlertNotification(c *middleware.Context) Response {
 }
 
 func GetAlertHistory(c *middleware.Context) Response {
+	alertId, err := getAlertIdForRequest(c)
+	if err != nil {
+		return ApiError(400, "Invalid request", err)
+	}
+
 	query := &annotations.ItemQuery{
-		AlertId: c.ParamsInt64("alertId"),
+		AlertId: alertId,
 		Type:    annotations.AlertType,
 		OrgId:   c.OrgId,
 		Limit:   c.QueryInt64("limit"),
@@ -244,3 +249,34 @@ func GetAlertHistory(c *middleware.Context) Response {
 
 	return Json(200, result)
 }
+
+func getAlertIdForRequest(c *middleware.Context) (int64, error) {
+	alertId := c.QueryInt64("alertId")
+	panelId := c.QueryInt64("panelId")
+	dashboardId := c.QueryInt64("dashboardId")
+
+	if alertId == 0 && dashboardId == 0 && panelId == 0 {
+		return 0, fmt.Errorf("Missing alertId or dashboardId and panelId")
+	}
+
+	if alertId == 0 {
+		//fetch alertId
+		query := models.GetAlertsQuery{
+			OrgId:       c.OrgId,
+			DashboardId: dashboardId,
+			PanelId:     panelId,
+		}
+
+		if err := bus.Dispatch(&query); err != nil {
+			return 0, err
+		}
+
+		if len(query.Result) != 1 {
+			return 0, fmt.Errorf("PanelId is not unique on dashboard")
+		}
+
+		alertId = query.Result[0].Id
+	}
+
+	return alertId, nil
+}