Hiya!
I halted the train this afternoon. tl;dr: I rolled wmf.20 to group1 and I
saw a huge spike in DB replag and Cirrus errors. Rolling back made them go
away!
There are tasks:
https://phabricator.wikimedia.org/T186765
https://phabricator.wikimedia.org/T186764
I think Eric/Stas already fixed the Cirrus bug. The other one was
temporally related, but I dunno about causally.
Needs more investigation if we want to roll forward tomorrow!
<3
-Chad