Let's try upgrading the current "otrs1001.eqiad.wmnet" to bullseye.
Also while doing that the name of the machine and the puppet module should change from OTRS to VRTS but that is T293942.
So this one here is about:
- requesting and creating a new machine, vrts1001 (or otrs1002 or vrts1002, heh)
- installing bullseye on that
- applying the puppet role and checking what goes wrong
- fix what goes wrong or have clarity what is missing
- some magic to import data if needed
- eventually switch production from old to new instance