Hostservice...Query: Add query column `instance_name'

refs #9943

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

@@ -21,6 +21,9 @@ class HostserviceproblemsummaryQuery extends IdoQuery
      * {@inheritdoc}
      */
     protected $columnMap = array(
+        'instances' => array(
+            'instance_name' => 'i.instance_name'
+        ),
         'services' => array(
             'host_name'                 => 'so.name1',
             'service_description'       => 'so.name2'
@@ -76,6 +79,18 @@ class HostserviceproblemsummaryQuery extends IdoQuery
         $this->joinedVirtualTables['services'] = true;
     }
 
+    /**
+     * Join instances
+     */
+    protected function joinInstances()
+    {
+        $this->select->join(
+            array('i' => $this->prefix . 'instances'),
+            'i.instance_id = so.instance_id',
+            array()
+        );
+    }
+
     /**
      * Join host groups
      */