That wouldn't be much help because the AWS and Heroku metrics are always green, no matter what. If you can't push updates to production, they count that as a developer-only outage and do not deduct it from their reported uptime.

For me, the most important metric would be time that me and my team spent fixing issues. And that went down significantly. After a year of everyone feeling burned out, now people can take extended vacations again.

One big issue for example was the connectivity between EC2 servers degrading, so that instead of the usual 1gbit/s they would only get 10mbit/s. It's not quite an outage, but it makes things painfully slow and that sluggishness is visible for end users. Getting reliable network speeds is much easier if all the servers are in the same physical room.