A database error has occurred.  Did you forget to run maintenance/update.php after upgrading?  See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script<br />
Query: SET NAMES utf8<br />
Function: DatabaseMysql::open<br />
Error: 1927 Lost connection to backend server: connection closed by peer (server3: Generated event) (database_maxscale:4006)<br />