librenms/includes/discovery/mempools.inc.php

<?php

echo("Memory : ");

include("mempools-hrstorage.inc.php");
include("mempools-cemp.inc.php");
include("mempools-cmp.inc.php");
include("mempools-junos.inc.php");
include("mempools-ironware-dyn.inc.php");

### Remove memory pools which weren't redetected here

$sql = "SELECT * FROM `mempools` WHERE `device_id`  = '".$device['device_id']."'";
$query = mysql_query($sql);

if($debug) { print_r ($valid_mempool); }

while ($test_mempool = mysql_fetch_array($query)) {
  $mempool_index = $test_mempool['mempool_index'];
  $mempool_type = $test_mempool['mempool_type'];
  if($debug) { echo($mempool_index . " -> " . $mempool_type . "\n"); }
  if(!$valid_mempool[$mempool_type][$mempool_index]) {
    echo("-");
    mysql_query("DELETE FROM `mempools` WHERE mempool_id = '" . $test_mempool['mempool_id'] . "'");
  }
  unset($mempool_oid); unset($mempool_type);
}

unset($valid_mempool);
echo("\n");

?>