yast2 not starting any more: loader error similar to already closed bug

No, nothing requires apache2-perl_mod.
The question is rather whether you need it for your web server.

I ditched that as mariadb suddenly started complaining about default installation being not secure for the first time (long after it had been installed for the first time). Software shouldn’t *****, but by default install a secure enough configuration. So I needed to uninstall mariadb which required me to remove the pattern;

You wouldn’t need to uninstall mariadb because of that.
The default installation doesn’t set up a password (hence it is “unsecure”), but it’s only accessible from localhost anyway. What password should it set?
To secure it, i.e. setup a root password, run “mysql_secure_installation” as the message tells you.

Although, if you don’t use it, it shouldn’t even run at all, so there is no security problem even without a password.

Also, mariadb is only suggested by that pattern, so you don’t need to remove the pattern to uninstall mariadb.
You have to remove the pattern to uninstall apache2-mod_perl though.

But a pattern is only a “recipe” what packages should be installed. They are there to make it easier to install a certain set of packages, like everything needed for a LAMP server, or some specific desktop environment.
Removing a pattern doesn’t do any change to your system.

Anyway, I think removing apache2-mod_perl solved my problem, but I’m amazed how many updates this apache2-mod_perl was preventing.
To me this is bug worthy.

Well, as I wrote already, the main problem here is that apache2-mod_perl fails to build for some time already.
And yes, this definitely should be fixed.

Again thanks for the very elaborate help and explanation.

Not yet

…the main problem here is that apache2-mod_perl fails to build for some time already.
And yes, this definitely should be fixed.

Is there a place where I can see that build status?

Here’s the Factory package on OBS:
https://build.opensuse.org/package/show/openSUSE:Factory/apache2-mod_perl