librenms-librenms/includes/polling/mempools/junos.inc.php

<?php

$oid = $mempool['mempool_index'];

d_echo('JunOS Mempool');

if (! is_array($mempool_cache['junos'])) {
    d_echo('caching');

    $mempool_cache['junos'] = [];
    $mempool_cache['junos'] = snmpwalk_cache_multi_oid($device, 'jnxOperatingBuffer', $mempool_cache['junos'], 'JUNIPER-MIB', 'junos');
    $mempool_cache['junos'] = snmpwalk_cache_multi_oid($device, 'jnxOperatingDRAMSize', $mempool_cache['junos'], 'JUNIPER-MIB', 'junos');
    $mempool_cache['junos'] = snmpwalk_cache_multi_oid($device, 'jnxOperatingMemory', $mempool_cache['junos'], 'JUNIPER-MIB', 'junos');
    d_echo($mempool_cache);
}

$entry = $mempool_cache['junos'][$mempool['mempool_index']];

$perc = $entry['jnxOperatingBuffer'];
// FIX ME -- Maybe another OID? Some equipment do not provide jnxOperatingDRAMSize like MX960
if ($entry['jnxOperatingDRAMSize']) {
    $memory_available = $entry['jnxOperatingDRAMSize'];
} else {
    $memory_available = ($entry['jnxOperatingMemory'] * 1024 * 1024);
}

$mempool['total'] = $memory_available;
$mempool['used'] = ($memory_available / 100 * $perc);
$mempool['free'] = ($memory_available - $mempool['used']);