In old Fedora package database (the one before src.fedoraproject.org ), if I remember correctly, in each package webpage, we used to have a history button that showed all changes in the list of package maintainers. Something like:

2018-07-01 foo was added by bar as package admin
.....
.....
etc.

This came to my mind when I found out that I have been removed from maintainers of a package and I could not find out when that happened.

It would be good to have such feature again