librenms-librenms/html/includes/graphs/rserver/auth.inc.php

<?php

if (is_numeric($vars['id'])) {
    // $auth= TRUE;
    $rserver = dbFetchRow('SELECT * FROM `loadbalancer_rservers` AS I, `devices` AS D WHERE I.rserver_id = ? AND I.device_id = D.device_id', array($vars['id']));

    if (is_numeric($rserver['device_id']) && ($auth || device_permitted($rserver['device_id']))) {
        $device = device_by_id_cache($rserver['device_id']);

        $rrd_filename = rrd_name($device['hostname'], array('rserver', $rserver['rserver_id']));

        $title  = generate_device_link($device);
        $title .= ' :: Rserver :: '.htmlentities($rserver['farm_id']);
        $auth   = true;
    }
}