fix for annotation promise clearing, bug introduced last week when merging react panels step1

public/app/features/annotations/annotations_srv.ts

-import './editor_ctrl';
-
+// Libaries
 import angular from 'angular';
 import _ from 'lodash';
+
+// Components
+import './editor_ctrl';
 import coreModule from 'app/core/core_module';
+
+// Utils & Services
 import { makeRegions, dedupAnnotations } from './events_processing';
 
+// Types
+import { DashboardModel } from '../dashboard/dashboard_model';
+
 export class AnnotationsSrv {
   globalAnnotationsPromise: any;
   alertStatesPromise: any;
   datasourcePromises: any;
 
   /** @ngInject */
-  constructor(private $rootScope, private $q, private datasourceSrv, private backendSrv, private timeSrv) {
-    $rootScope.onAppEvent('refresh', this.clearCache.bind(this), $rootScope);
-    $rootScope.onAppEvent('dashboard-initialized', this.clearCache.bind(this), $rootScope);
-  }
-
-  clearCache() {
-    this.globalAnnotationsPromise = null;
-    this.alertStatesPromise = null;
-    this.datasourcePromises = null;
+  constructor(private $rootScope, private $q, private datasourceSrv, private backendSrv, private timeSrv) {}
+
+  init(dashboard: DashboardModel) {
+    // clear promises on refresh events
+    dashboard.on('refresh', () => {
+      this.globalAnnotationsPromise = null;
+      this.alertStatesPromise = null;
+      this.datasourcePromises = null;
+    });
   }
 
   getAnnotations(options) {

public/app/features/dashboard/dashboard_ctrl.ts

+// Utils
 import config from 'app/core/config';
-
+import appEvents from 'app/core/app_events';
 import coreModule from 'app/core/core_module';
+
+// Services
+import { AnnotationsSrv } from '../annotations/annotations_srv';
+
+// Types
 import { DashboardModel } from './dashboard_model';
 import { PanelModel } from './panel_model';
 
@@ -21,6 +27,7 @@ export class DashboardCtrl {
     private dashboardSrv,
     private unsavedChangesSrv,
     private dashboardViewStateSrv,
+    private annotationsSrv: AnnotationsSrv,
     public playlistSrv
   ) {
     // temp hack due to way dashboards are loaded
@@ -49,6 +56,7 @@ export class DashboardCtrl {
     // init services
     this.timeSrv.init(dashboard);
     this.alertingSrv.init(dashboard, data.alerts);
+    this.annotationsSrv.init(dashboard);
 
     // template values service needs to initialize completely before
     // the rest of the dashboard can load
@@ -72,7 +80,7 @@ export class DashboardCtrl {
         this.keybindingSrv.setupDashboardBindings(this.$scope, dashboard);
         this.setWindowTitleAndTheme();
 
-        this.$scope.appEvent('dashboard-initialized', dashboard);
+        appEvents.emit('dashboard-initialized', dashboard);
       })
       .catch(this.onInitFailed.bind(this, 'Dashboard init failed', true));
   }

public/app/features/panel/solo_panel_ctrl.ts

@@ -14,7 +14,7 @@ export class SoloPanelCtrl {
       const params = $location.search();
       panelId = parseInt(params.panelId, 10);
 
-      $scope.onAppEvent('dashboard-initialized', $scope.initPanelScope);
+      appEvents.on('dashboard-initialized', $scope.initPanelScope);
 
       // if no uid, redirect to new route based on slug
       if (!($routeParams.type === 'script' || $routeParams.type === 'snapshot') && !$routeParams.uid) {