bing back failed messages groups on instances

Author: tmasternak

src/ServicePulse.Host/app/modules/monitoring/views/endpoint_details.html

@@ -280,6 +280,12 @@ <h5 ng-class="{active: showInstancesBreakdown}">
                                                 <span class="warning" ng-if="instance.isStale">
                                                     <i class="fa pa-endpoint-lost endpoint-details" uib-tooltip="Unable to connect to instance"></i>
                                                 </span>
+                                                <span class="warning" ng-if="instance.errorCount">
+                                                    <a ng-if="instance.errorCount" class="warning btn" href="#/failed-messages/groups/{{endpointName}}/{{sourceIndex}}/{{instance.serviceControlId}}">
+                                                        <i class="fa fa-envelope"></i>
+                                                        <span class="badge badge-important ng-binding">{{instance.errorCount | metricslargenumber}}</span>
+                                                    </a>
+                                                </span>
                                             </div>
                                         </div>
                                     </div>