librenms-librenms/html/includes/graphs/application/rrdcached.inc.php

<?php
/**
 * rrdcached.inc.php
 *
 * Generate the rrd file and verify it is valid
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @package    LibreNMS
 * @link       http://librenms.org
 * @copyright  2016 Tony Murray
 * @author     Tony Murray <murraytony@gmail.com>
 */

$rrd = rrd_name($device['hostname'], array('app', 'rrdcached', $app['app_id']));
if (rrdtool_check_rrd_exists($rrd)) {
    $rrd_filename = $rrd;
}