Over the past few days I've frequently had attempts to
fetch a https://www.postgresql.org/message-id/... URL
fail with reports like
Error 503 Backend fetch failed
Backend fetch failed
Guru Meditation:
XID: 89820252
Varnish cache server
It eventually works if I reload enough times. Discussion
on Discord says that other people have seen this too.
The problem seems noticeably worse right now ...
regards, tom lane