Your Wikibase installation will now require you to include its
entrypoint. (No change needed for production.)
If you didn't already have something like this in your LocalSettings.php
you now need to:
require_once "$IP/extensions/Wikibase/Wikibase.php";
Or alternatively:
require_once "$IP/extensions/Wikibase/repo/Wikibase.php";
require_once "$IP/extensions/Wikibase/client/Wikibase.php";
Change that caused this:
https://gerrit.wikimedia.org/r/#/c/217947/
There might be future changes in this area, for switching to
https://www.mediawiki.org/wiki/Manual:Extension_registration but those
should hopefully be backwards compatible to the above.
--
Regards,
Jan Zerebecki