Noticed that https://tools.wmflabs.org/versions is out of date today (2018-08-24).
It's currently showing the 1.32.0-wmf.16 is on group1 and group2; however, 1.32.0-wmf.18 went live on those wikis yesterday.
This has caused a bit of confusion.
FWIW, in my local browser I see https://noc.wikimedia.org/conf/wikiversions.json has an age header of 60516. When I add a parameter like ?cachebust=true I get the up-to-date-page.