alt Hacker NewsObservability and alerting is pretty standard devops. Both the dev and infrastructure teams dropped the ball here. But at least as part of remediating this you added alerting to make sure you’d notice when your twillio connection fails in the future, right?
Even better, infrastructure enabled IPv6, and the issue was closed.
In corporate software development, we work the tickets assigned, and keep our KPIs up so that we don't face the wrath of the bean counters.