Hi,
seems, your latest update (we do updates automatically through watchful.li) killed our 38 production sites.
The error we're getting is: Interface 'Joomla\Database\DatabaseAwareInterface' not found. (There were also some different errors in connection with quickicon in the backend and actionlog in the frontend, depending on which plugins are enabled).
Disabling all Akeeba Backup plugins by renaming their directories fixes the issue.
BR,
Chris