If Audit Trail is going to show a holistic view of activity in Marketo, it should show campaigns that are deactivated during Idle Trigger Campaign Cleanup.
Idle Trigger Campaign Cleanup just occurred on our instance and I wasn't able to review the list beforehand, and now I don't have a good way to see which campaigns were affected. I thought for sure these campaigns would show up in Audit Trail since activate/deactivate are part of the Actions filter. But, they don't show up.