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Full functionality on Mathematics is restored. Now the fun begins: determine how it happened, and make sure it doesn't happen again.

We have added an answer on Mathematics meta explaining how the site got stuck in read-only mode, what we learned, and how we can try to prevent a recurrence. math.meta.stackexchange.com/q/34652/13515

We are experiencing elevated DDoS activity, we are investigating user reports of error messages. The site is currently up and running.

We've identified an issue with our CDN causing intermittent 503 errors for people in the Chicago area.

We have now resolved the intermittent issues affecting users in the Chicago area.

We are actively investigating an issue causing degraded site performance.

We have identified the cause of the site instability and believe we have resolved the issue.

We are currently investigating unusually high load on our servers that is causing a service interruption at the moment.

We've made some adjustments to our back end systems to try and mitigate the ongoing issues. We will be actively monitoring the situation as it develops.

We have maintenance scheduled at 00:00 UTC 08-23-2022 to upgrade Redis across the network. You can read the details in the Meta post. meta.stackexchange.com/questions/3813…

The server maintenance has now been completed.

We have some maintenance scheduled for Wednesday, 21 September, 00:30-03:00 UTC. Read details on this Meta post: meta.stackexchange.com/q/382050/314146

OK, maintenance is over, and the site is back to normal. We ran into a couple issues with our database maintenance--we'll update the meta post for this incident with details once we have them.

With our recent status page improvements (meta.stackexchange.com/q/378941/165455), links to posts on the old site now land on an empty 404 page. To fix your existing links, please change stackstatus . net / post / ... to stackstatus . tumblr . com / post / ...