The 1.34.0-wmf.16 version of MediaWiki is blocked[0].

The new version can't proceed to group0[1] until this issue is resolved:

* serialize(): "" returned as member variable from __sleep() but does not exist - https://phabricator.wikimedia.org/T229366

Once this issue is resolved train can resume. If this issue is resolved on a Friday the train will resume Monday.

Thank you for your help resolving these issues!

-- Your unassuming train minion

[0]. https://phabricator.wikimedia.org/T220741 [1]. https://tools.wmflabs.org/versions/