Due to today's train deployment more than doubling the error rate seen in
fatalmonitor[1], I have rolled-back group 1 wikis to wmf.11. I've submitted
an UBN task T172320 [2] detailing the error, which appears to be fallout
from issues in Wikibase first noticed two weeks ago.
I expect that this will be easily resolved once someone familiar with the
issue has had a chance to look into it and the train should be back on
track in time for tomorrow's deployment.
1.
https://logstash.wikimedia.org/goto/5acde54fdb7b071b5723607c9f57eb9c
2.
https://phabricator.wikimedia.org/T172320