Is there a log file that tracks user creation and group assignment?

See here: forum.appian.com/.../e-174269.

However, I just looked at it documentation again and it seems like the Object Role Map would work for group assignments and removals. forum.appian.com/.../Logging.html

I believe this log file was added in 16.1 when they allowed existing rolemaps to be overwritten on import. forum.appian.com/.../Appian_Release_Notes.html

Hey Mathieu,
Unfortunately the role map only covers permissions for objects - not memberships (ie: who the group's administrator is vs who belong to that group)

Yes, you are right. It only works to log changes to Group administrators.

When need arises I create two rule ....one to get the list of disctinct user create and second rule the list of date on which they were created, transposing both the rule output vertically in excel solves the purpose.