Please see https://phabricator.wikimedia.org/T243925
(and https://www.mediawiki.org/wiki/Gerrit/Privilege_policy if you are
unfamiliar with the +2 process but curious about it)
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Small status update: All wikis have now been rolled back to 1.35.0-wmf.16
in order to limit the fallout from T244529.
There is a tentative plan for unblocking the train but we will revisit that
on Monday.
Thanks to everyone who jumped in to help diagnose issues, restore services
and especially
When deploying MediaWiki 1.35.0-wmf.18 to Group 2 wikis on Thursday, there
was a serious incident which took down all wikis for several minutes and
resulted in a rollback to wmf.16.
My current understanding is that attempting to deploy wmf.18 again is
likely to cause another severe outage. The
