https://pulls.web-platform-tests.org/ is now 504 Gateway Time-out.

@mdittmer set up https://bit.ly/ecosystem-infra-status a while ago and from that it's clear that downtime is pretty frequent, some downtime almost every day. This matches what I've experienced, which is that every so often that I take a look, it's slow or down. Recent reports of the same kind: #39 #42 #46

I'm calling this a roadmap issue, because apparently there's something not quite right about the setup causing it to frequently go down. Let's call this resolved when we've seen a week with no downtime.

@mdittmer, can you increase the checking rate to 5 minutes for these checks?