librenms-librenms/includes/polling/processors/viprinux.inc.php

<?php
echo 'Viprinet CPU Usage';

if ($device['os'] == 'viprinux') {
    $usage = str_replace('"',"", snmp_get($device, 'VIPRINET-MIB::vpnRouterCPULoad.0', '-OvQ'));
    if (is_numeric($usage)) {
        $proc = ($usage * 100);
    }
}