Novell ZENWORKS LINUX MANAGEMENT 7.2 IR2 - ADMINISTRATION GUIDE 09-25-2008 Administration Manual page 509

From here you can do the following:
Acknowledge all event messages for the device. This acknowledges all events within a
specified date range and deletes them from the Hot List, event log, and system event log.
Clear all event messages. This clears all events within a specified date range from the
event log, system event log, advanced event log, and advanced system event log.
Permanently delete all event messages. This deletes all events within a specified date
range from all the log lists and the database.
5 When you have selected the option you want and set a date range, click OK to clear the
messages.
Working with Event Logs 509