Per consensus, Polish Wikipedia community agreed to remove 'obsolete-tag' from $wgSignatureAllowedLintErrors.
(The next step is going to be setting $wgSignatureValidation = 'disallow' but I'll request it in a month or so).
Link to discussion: https://pl.wikipedia.org/w/index.php?title=Wikipedia:Kawiarenka/Og%C3%B3lne&oldid=73494086#B%C5%82%C4%99dy_lintera_w_podpisach_%E2%80%93_zmiana_konfiguracji_wiki
Change #1019176 had a related patch set uploaded (by Msz2001; author: Msz2001):
[operations/mediawiki-config@master] Remove 'obsolete-tag' from $wgSignatureAllowedLintErrors on Polish Wikipedia
Change #1019176 merged by jenkins-bot:
[operations/mediawiki-config@master] Remove 'obsolete-tag' from $wgSignatureAllowedLintErrors on Polish Wikipedia
Mentioned in SAL (#wikimedia-operations) [2024-04-16T13:11:11Z] <logmsgbot> lucaswerkmeister-wmde@deploy1002 Started scap: Backport for [[gerrit:1019176|Remove 'obsolete-tag' from $wgSignatureAllowedLintErrors on Polish Wikipedia (T362414)]]
Mentioned in SAL (#wikimedia-operations) [2024-04-16T13:14:24Z] <logmsgbot> lucaswerkmeister-wmde@deploy1002 msz2001 and lucaswerkmeister-wmde: Backport for [[gerrit:1019176|Remove 'obsolete-tag' from $wgSignatureAllowedLintErrors on Polish Wikipedia (T362414)]] synced to the testservers (https://wikitech.wikimedia.org/wiki/Mwdebug)
Mentioned in SAL (#wikimedia-operations) [2024-04-16T13:29:51Z] <logmsgbot> lucaswerkmeister-wmde@deploy1002 Finished scap: Backport for [[gerrit:1019176|Remove 'obsolete-tag' from $wgSignatureAllowedLintErrors on Polish Wikipedia (T362414)]] (duration: 18m 39s)