adds pending filter for alert list page

public/app/features/alerting/AlertRuleList.tsx

@@ -29,6 +29,7 @@ export class AlertRuleList extends PureComponent<Props, any> {
     { text: 'Alerting', value: 'alerting' },
     { text: 'No Data', value: 'no_data' },
     { text: 'Paused', value: 'paused' },
+    { text: 'Pending', value: 'pending' },
   ];
 
   componentDidMount() {

public/app/features/alerting/__snapshots__/AlertRuleList.test.tsx.snap

@@ -81,6 +81,12 @@ exports[`Render should render alert rules 1`] = `
             >
               Paused
             </option>
+            <option
+              key="pending"
+              value="pending"
+            >
+              Pending
+            </option>
           </select>
         </div>
       </div>
@@ -230,6 +236,12 @@ exports[`Render should render component 1`] = `
             >
               Paused
             </option>
+            <option
+              key="pending"
+              value="pending"
+            >
+              Pending
+            </option>
           </select>
         </div>
       </div>