Due to migrating most of RT to Phabricator, phabricator.wikimedia.org will be down and NOT AVAILABLE for eight hours starting on Thursday 18 December 00:00 UTC (that is Wed 17 Dec 16:00PST for people in San Francisco).
In those eight hours, urgent issues which cannot wait should be brought up either on IRC or https://www.mediawiki.org/wiki/Project:Support_desk
Thank you for your understanding and sorry for the inconvenience.
andre