"Current status: We're continuing to pursue all available pathways to restore service, as our actions taken thus far have not provided the anticipated relief. Our investigation has found that a core process on the affected servers is becoming overwhelmed, which causes the servers to stop responding and contributes to the capacity loss."

I mean, either roll back your update or there is a malicious actor involved.

The 4:11 AM UTC update claims no indications of malicious activity (obviously I have no way to judge that, just copying it here):

Current status: As part of our investigation into the sustained traffic management imbalances, we’re reviewing traffic flows and affected infrastructure to identify opportunities to optimize routing. This includes verifying the reasons for service failures so we can develop specific actions to improve stability.

We will continue to share more information as soon as we have it, and for now we can confirm that there is no indication this is the result of malicious activity. We’ll continue to apply learnings towards remediation actions as we confirm effectiveness mitigation actions.

It's been a while since we had a good Windows Worm with this kind of behavior

https://en.wikipedia.org/wiki/SQL_Slammer

https://en.wikipedia.org/wiki/Conficker

It's almost as if they've identified that and are doing just that