It might actually be worthwhile for a third-party status site/monitoring service to have a way to send this mail to users. It would be thousands of users per developer tool, but not millions like consumer services, so technically a much simpler service.

Letting users set "I must ack notifications of outages or keep pinging me" would make sense, too.

I'd probably consider mobile push notifications with confirmation and/or voice or SMS as well.

Basically like Nagios, but for third-party components.