I am seeing a number of 503s from beta labs but upon checking, everything looks normal. Here is an example: https://integration.wikimedia.org/ci/job/browsertests-Echo-en.wikipedia.beta.wmflabs.org-linux-firefox-sauce/136/testReport/junit/(root)/Notification%20types/The___message_is_not_a_keyword/
Possibly related to https://bugzilla.wikimedia.org/show_bug.cgi?id=72162
Version: unspecified
Severity: major
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=72982