librenms-librenms/includes/discovery/mempools/powerconnect-cpu.inc.php

<?php

if ($device['os'] == 'powerconnect') {
    echo 'Powerconnect: ';

    $free = snmp_get($device, 'dellLanExtension.6132.1.1.1.1.4.1.0', '-OvQ', 'Dell-Vendor-MIB');

    if (is_numeric($free)) {
        discover_mempool($valid_mempool, $device, 0, 'powerconnect-cpu', 'CPU Memory', '1', null, null);
    }
}