Add a module for /ping that can be used for website monitoring utilities.

application/modules/ping/controllers/IndexController.php

+<?php
+
+class Ping_IndexController extends Unl_Controller_Action
+{
+	public function indexAction()
+	{
+		$this->getResponse()->setHeader('Content-type', 'text/plain');
+		$this->_disableLayoutAndView();
+		echo 'pong';
+	}
+}