FreeBSD mempools Fix (#9659)

* add hrMemorySize polling

* switch to sysObjectID that is more gereric

* add snmprec data

* Create pfsense.json

includes/polling/mempools/hrstorage.inc.php

@@ -3,6 +3,8 @@
 // HOST-RESOURCES-MIB - Memory Objects
 if (!is_array($storage_cache['hrstorage'])) {
     $storage_cache['hrstorage'] = snmpwalk_cache_oid($device, 'hrStorageEntry', null, 'HOST-RESOURCES-MIB:HOST-RESOURCES-TYPES');
+    $storage_cache['memorySize'] = snmp_get($device, 'hrMemorySize.0', '-OUqv', 'HOST-RESOURCES-MIB');
+    $storage_cache['memorySize'] = $storage_cache['memorySize'] * 1024; // hrMemorySize is stored in KBytes
     d_echo($storage_cache);
 } else {
     d_echo('Cached!');
@@ -12,5 +14,9 @@ $entry = $storage_cache['hrstorage'][$mempool['mempool_index']];
 
 $mempool['units'] = $entry['hrStorageAllocationUnits'];
 $mempool['used']  = ($entry['hrStorageUsed'] * $mempool['units']);
-$mempool['total'] = ($entry['hrStorageSize'] * $mempool['units']);
+if ($device['sysObjectID'] == '.1.3.6.1.4.1.12325.1.1.2.1.1') { // bsnmpd based devices, like FreeBSD, opnsense, pfsense ...
+    $mempool['total'] = $storage_cache['memorySize'];
+} else {
+    $mempool['total'] = ($entry['hrStorageSize'] * $mempool['units']);
+}
 $mempool['free']  = ($mempool['total'] - $mempool['used']);