The term of art you're looking for is: "heartbeat check"/"healthcheck", or most commonly: "cron job monitor".
There’s no crontab for banking days. Deadcheck also requires checkins within a delta of the expected checking time.
Deadcheck also doesn’t rely on your infra to alert.
Yeah I thought "dead man's switch" was such a weird name for this.
Seems very similar to a 'watchdog', just... reporting instead of doing anything about it.