We just had to rollback 1.31.0-wmf.16 from group1 (eg: all non-wikipedias), so -wmf.16 is only on group0 at this time.
The issue is a data corruption bug[0]. The relevant people are aware.
Reminder that we have a task for each train rollout to track (potential) blockers; the one for this week is [1]. You can follow that task to track future progress.
Additional reminder that you can use the "Wikimedia MediaWiki versions"[2] tool on Toolforge to know which wikis have which version at any time.
Greg
[0] https://phabricator.wikimedia.org/T184749 [1] https://phabricator.wikimedia.org/T180749 [2] https://tools.wmflabs.org/versions/