processmaker-files/workflow/engine/methods/tracker/tracker_Save.php

<?php
if (isset( $_POST['form'] ))
    $sValue = $_POST['form']; //For old processmap
else
    $sValue = $_POST;

unset( $sValue['SAVE'] );
if (! isset( $sValue['CT_DERIVATION_HISTORY'] )) {
    $sValue['CT_DERIVATION_HISTORY'] = 0;
}
if (! isset( $sValue['CT_MESSAGE_HISTORY'] )) {
    $sValue['CT_MESSAGE_HISTORY'] = 0;
}
require_once 'classes/model/CaseTracker.php';
$oCaseTracker = new CaseTracker();
$oCaseTracker->update( $sValue );

$infoProcess = new Process();
$resultProcess = $infoProcess->load($sValue['PRO_UID']);

if($sValue['CT_DERIVATION_HISTORY'] == 1) {
    $type[] = "Routing History";
}
if($sValue['CT_MESSAGE_HISTORY'] == 1) {
    $type[] = "Messages History";
}
G::auditLog('CaseTrackers','Save Case Tracker Properties ('.$sValue['CT_MAP_TYPE'].' - '.implode(', ',$type).') in Process "'.$resultProcess['PRO_TITLE'].'"');