Audit Logging
There is a built-in per-project audit log that can be accessed through the web UI at Project → Audit Log.
Note that audit log entries are globally linked to actions performed within the system and the administrator UI can be used to get a global overview of the actions performed within the entire system (requires your own Nexigon instance).
The audit log cannot be manipulated through the UI or API. The only way to manipulate it is through direct database access.