<quote name="Greg Grossmeier" date="2018-01-11" time="12:27:35 -0800">
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.
Status update: The fix is merged into master (with a backport to wmf.16) and thus on the Beta Cluster for testing. Given it is a Friday we will attempt a continuation of the train on Monday (per policy[0]), to be coordinated with Mukunda and/or Tyler (it's on the border of a train conductor switch over) and Addshore.
Greg
[0] https://wikitech.wikimedia.org/wiki/Deployments/Holding_the_train#What_happens_next?