Full event logs cannot be detected on this machine, this feature is not supported on this platform (only Windows 2000 or higher).
EventSentry can detect when an event log is full and notify you by email and methods. This feature is only supported on Windows 2000 and higher, and this message is logged when this feature is configured on a computer running Windows NT4.
This message can be safely ignored when it is logged on a Windows NT4 machine.
You can configure this feature at "Packages -> System Health Packages -> Package Name -> Backup Event Logs -> Full Event Log Detection".