The Audit log report may reveal when an object like Host groups, Hosts, Items, Triggers... you name it, was changed by whom.
The Audit log is only available to users of type Zabbix Super Admin - for good reasons of course. Further, it is rather useful to find out who did what, resp. to walk over the traced actions as a whole.
In a multi-user environment, it is valuable to users to see who has changed what, when, on a particular object.
So, how about extending all the configuration views available to users of type Zabbix Admin, with another tab showing the audit log for the currently edited object?
This list should of course only list actions of users sharing the same user group. The list should also not reveal a user's IP address.
Extending the scope to configuration objects only available to Zabbix Super Admin users might be worth to think of too.