ContactgroupQuery: Add query column `instance_name'

refs #9943

modules/monitoring/library/Monitoring/Backend/Ido/Query/ContactgroupQuery.php

@@ -17,6 +17,9 @@ class ContactgroupQuery extends IdoQuery
      * {@inheritdoc}
      */
     protected $columnMap = array(
+        'instances' => array(
+            'instance_name' => 'i.instance_name'
+        ),
         'contactgroups' => array(
             'contactgroup'          => 'cgo.name1 COLLATE latin1_general_ci',
             'contactgroup_name'     => 'cgo.name1',
@@ -187,6 +190,18 @@ class ContactgroupQuery extends IdoQuery
         );
     }
 
+    /**
+     * Join instances
+     */
+    protected function joinInstances()
+    {
+        $this->select->join(
+            array('i' => $this->prefix . 'instances'),
+            'i.instance_id = cg.instance_id',
+            array()
+        );
+    }
+
     /**
      * {@inheritdoc}
      */

modules/monitoring/library/Monitoring/DataView/Contactgroup.php

@@ -11,6 +11,7 @@ class Contactgroup extends DataView
     public function getColumns()
     {
         return array(
+            'instance_name',
             'contactgroup_name',
             'contactgroup_alias',
             'contact_object_id',