Full incident tooling assumes a rotation, an escalation policy and somebody paid to carry the pager. Plenty of teams have none of those and still need to know when the deploy went out or the error rate moved.
This is the lightweight end of that spectrum: the events you would otherwise learn about from a Slack channel you muted, delivered to the one device you do not mute.
Particularly useful when the deploy was triggered by someone else, or by a merge you were not watching.
The first occurrence of a new issue is the one worth interrupting you for. Everything after it is noise.
For small teams where a review blocking for a day is a real cost.
Rare, and exactly the sort of rare you want to hear about immediately.
Each of these sends the events above. Setup is the same for all of them.