I know it's popular to be a "developer-centric" organization these days, but please, please, don't schedule risky maintenance operations for 10 AM on a Monday, when your tools are in heavy usage.

Every SaaS product I've built has analyzed traffic, and performed migrations/deployments at off-hours (generally, after midnight in our dominant time zone). In this case, the outage may have resulted in hundreds (thousands?) of paged administrators across the world, but at least fewer end-users would have been affected.

Also, at scale, it's a good idea to deploy to a single cluster/zone first, and check error rates before deploying to the larger environment.

It's pretty scary that the 'professionals' to whom I've trusted my business aren't more savvy when it comes to high availability...