Clean auditing

This task removes auditing events that are older than a specific number of days.
Clean auditing scheduled tasks can be defined at either the system or zone level:

• System tasks apply across all zones.
• Zone tasks apply only within their specific zone.

The system-level task has a default clean-up audit period of 30 days.
If a zone-level task is set to 15 days, both the system-level and zone-level task will run independently.
However, if a zone-level task is set to run after 45 days, the system-level task will still clean up data after 30 days, overriding the longer zone-level period.

Disabling this scheduled task will cause the auditing events table to grow uncontrollably. We therefore do not recommend disabling this task.