The system log is a page which logs certain system events. This is mainly useful for troubleshooting purposes in conjunction with GuestJoy support.
You are able to see which user made each change, and in some cases, you will see a button labelled Info, which will show you the exact change that was made. You might need assistance from GuestJoy Support to interpret those changes.
If you do use this page, do note the ability to filter the entries in the list if you are looking for something in particular.