1 and 2 - check the audit logs, the admin audit may have it, and the add-on audit log definitely will
3, 4 and 5 - that's pretty much impossible for add-ons. You need a different strategy for each type of add-on.
Add-ons are installed globally and add all sorts of functions. For some add-ons, you could try trawling access logs (if you have them) to see if users are hitting the urls it provides, but even that wouldn't give you any answer for projects. If the add-on provides a workflow function, you could look through all the workflows to work out where it's been used, then look at which projects use that workflow and then the users with permission to perform that transition and hence get users too, followed by looking at all the issue history to find out when the transition was executed. And for an add-on that does diagrams, look at attachments. And for an add-on that... Well, you see the point - there's no way to just say "last used/users/projects" for add-ons in general
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