I keep getting 503 errors:
I tried going to my watchlist on enwiki, and saw the following error
Special:Watchlist - Request from [redacted] via cp1089 cp1089, Varnish XID 928187350 Error: 503, Backend fetch failed at...
Furthermore, it appears that user script imports are randomly not working, instead logging
GET [script url] net::ERR_ABORTED 503
Potentially related, going to the main page of the simple english wikipedia alternates between working and an error, such as
...via cp1089 cp1089, Varnish XID 921831419 Error: 503, Backend fetch failed at...