Hi, the DNS name for irc.wikimedia.org [1] will be redirected to a new instance (irc2001.wikimedia.org) tomorrow (European) morning. This new instance is running a more recent OS (Debian 10/Buster).
Mediawiki changes are currently broadcasted to both the old server (kraz.wikimedia.org) and the new irc2001.wikimedia.org. As such, the failover should be transparent, unless for some reason a bot has hardcoded kraz.wikimedia.org or it's IP address 208.80.153.44 (which will then need to be updated to resolve irc.wikimedia.org). The old instance will be around for another week.
If there are any issues, please report them at https://phabricator.wikimedia.org/T224579
Cheers, Moritz
Footnotes: [1] https://wikitech.wikimedia.org/wiki/Irc.wikimedia.org