The audit log
Something went wrong on a project: a lot was removed, nobody knows what or by whom, and you need to see what was there so you can put it back. The audit log is an Owner’s record of changes on project boards: who changed what, when, and what it was before, including the full content of anything that was deleted.
It also keeps the requests behind changes made by AI, the changes to who can open a project, and the changes made to Service Desk requests. It is a read-only report: nothing in it can be edited, and it has no restore button.
The full chapter, with every step and setting, is in the app: open your account menu and select User manual.