The 1.39.0-wmf.1 version of MediaWiki is blocked[0].

The new version is deployed to testwikis, but can proceed no
further until these issues are resolved:

* Wikimedia\Rdbms\DBTransactionError: Transaction round stage must be 'cursory' (not 'within-rollback-callbacks') - https://phabricator.wikimedia.org/T281451
* Wikimedia\Timestamp\TimestampException: Wikimedia\Timestamp\ConvertibleTimestamp::getTimestamp: The timestamp cannot be represented in the specified format - https://phabricator.wikimedia.org/T304307

Once these issues are resolved train can resume. If these issues are
resolved on a Friday the train will resume Monday.

Thank you for your help resolving these issues!

-- Your humble train toiler

[0]. https://phabricator.wikimedia.org/T300203
[1]. <https://versions.toolforge.org/>