It seems to be partitioned by account. The Jira/Confluence/Opsgenie accounts that I use have been gone since Tuesday, but it's clear that other sites/accounts are working fine.

I have have been using it all week - up to and including yesterday. No issues.

I’ve been using JIRA in the last four days without any issues (other than a potential issue with the iOS app, but I was in a poor data area at the time).