Looking at the admin log ,Some of the operation identifiers are clear what they mean or did but many do not.
Like
MAIL_WATCH_F( does this mean it was just added to a watched item or does it mean a watched item was emailed))
MAIL_WATCH_T(same as above)
LOGINAS ( I think this is become a member)

Has somebody ever posted a legend key with descriptions?

Blue Man Group
There is no such thing as stupid questions. Just stupid answers