Chapter 1 What’s New for FortiOS 5.2.1 : Security Profiles : Web Filtering : Additional Replacement Message Variables
  
Additional Replacement Message Variables
Along with the variables for source IP (%%SOURCE_IP%%), destination IP (%%DEST_IP%%), and user name (%%USERNAME%%) that have been added for all replacement messages, the following variables can now be added to replacement messages for web filtering:
Group name (%%GROUPNAME%%)
Policy UUID (%%POLICY_UUID%%)
FortiGate Hostname (%%FGT_HOSTNAME%%)