Hello,
1.36.0-wmf.28 had to be rolled back entirely on Friday due to a faulty hard deprecation of some of MediaWiki interfaces.
Backport patches have/are being merged right now. I will push the train to group 0 as soon as that has completed.
I will push to group 1 13:00 UTC / 14:00 CET (just after the backport window).
The rest of wikis will be done later tonight, at 20:00 UTC which is the usual American train slot.
Train blocker task: https://phabricator.wikimedia.org/T271342