is not in the sudoers file

My user account did have working sudo privileges. Now it does not. Happening on at least 2 different machines.

Added user to group “wheel” but does not fix issue.

a) Why was sudoers privileges changed (broken) from how it was and b) how is this fixed?

An aside: why is that crusty, rusty, 1970’s “This incident has been reported to the administrator” error message still in there?

https://marc.info/?l=opensuse-factory&m=166781014221346

And additionally the magic forum search function:
https://forums.opensuse.org/showthread.php/577669-Sudo-broken-after-latest-update?highlight=sudo
https://forums.opensuse.org/showthread.php/577693-sudo-akzeptiert-Root-Passwort-nicht?highlight=sudo
https://forums.opensuse.org/showthread.php/577678-sudo-not-working?highlight=sudo
https://forums.opensuse.org/showthread.php/577675-»dominik«-ist-nicht-in-der-sudoers-Datei?highlight=sudo
https://forums.opensuse.org/showthread.php/577663-Error-con-sudo-en-el-ultimo-snapshot!!?highlight=sudo

Maybe there’s something wrong with me, but that question elicited a strong sense of amusement from me. Thanks for the chuckle!
I can think of several snappy answers, but I think your question was serious and my answers certainly would not be.

Cheers
Bart