I'm getting various errors on WMF wikis right now.
First, CSS would not load when I tried to visit https://meta.wikimedia.org/w/index.php?title=Steward_requests/Global_permissions&action=history (and that page still takes way longer to load than it should)
Also on svwiki, I got these Wikimedia errors. When I tried to visit https://sv.wikipedia.org/w/index.php?namespace=4&tagfilter=&title=Special%3ASenaste+%C3%A4ndringar I got
Request from 184.108.40.206 via cp3032 cp3032, Varnish XID 384860270
Error: 503, Backend fetch failed at Thu, 04 May 2017 07:02:47 GMT
Then I tried to visit https://sv.wikipedia.org/wiki/Special:Senaste_%C3%A4ndringar and got
Request from 220.127.116.11 via cp3041 cp3041, Varnish XID 263225564
Error: 503, Backend fetch failed at Thu, 04 May 2017 07:16:06 GMT
On top of all that, deleted pages still turn up in RecentChanges.