Was Slack offline mid-afternoon or so (EDT) May 12? One of my instances had it showing nothing but an Error 503; refreshing didn’t help. (I’m on a different instance now, and it seems fine.)

@james-clojure Yes, Slack had an outage from about 4:50 pm for maybe half an hour or so.

https://status.slack.com/2020-05-12 -- looks like it took them a couple of hours to get everything back to normal. Some nodes recovered earlier than others.