I have spotted a notice on beta cluster:
Notice: Undefined variable: wmgMFUseCentralAuthToken in /srv/mediawiki-staging/wmf-config/mobile-labs.php on line 20
Reproduction case:
local$ ssh deployment-tin.deployment-prep.eqiad.wmflabs deployment-tin$ mwscript eval.php --wiki=commonswiki PHP Notice: Undefined variable: wmgMFUseCentralAuthToken in /srv/mediawiki-staging/wmf-config/mobile-labs.php on line 20 Notice: Undefined variable: wmgMFUseCentralAuthToken in /srv/mediawiki-staging/wmf-config/mobile-labs.php on line 20