After 45831e6 was merged, https://en.wikipedia.beta.wmflabs.org/wiki/Main_Page started to say:
Original exception: [XWKYxqwQBHcAAHEcZAYAAAAO] /wiki/Main_Page Wikimedia\Rdbms\DBQueryError from line 1587 of /srv/mediawiki/php-master/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading? Query: SELECT blob_text FROM `blobs` WHERE blob_id = '111937' LIMIT 1 Function: ExternalStoreDB::fetchBlob Error: 1146 Table 'enwiki.blobs' doesn't exist (172.16.5.170:3306)
After reverting 45831e6 on beta, all started to work.