Added edgeAttributeKeys constants

@@ -402,6 +402,12 @@ export default angular.module('thingsboard.types', [])
                 attributesDeleted: "ATTRIBUTES_DELETED",
                 timeseriesUpdated: "TIMESERIES_UPDATED"
             },
+            edgeAttributeKeys: {
+                active: "active",
+                lastConnectTime: "lastConnectTime",
+                lastDisconnectTime: "lastDisconnectTime",
+                queueStartTs: "queueStartTs"
+            },
             importEntityColumnType: {
                 name: {
                     name: 'import.column-type.name',

@@ -225,7 +225,7 @@ export default function EventTableDirective($compile, $templateCache, $rootScope
 
         scope.loadEdgeInfo = function() {
             attributeService.getEntityAttributesValues(scope.entityType, scope.entityId, types.attributesScope.server.value,
-                ["queueStartTs"], {})
+                types.edgeAttributeKeys.queueStartTs, {})
                 .then(function success(attributes) {
                     scope.onUpdate(attributes);
                 });