I have something like this for myself: a server listens for POSTs on LAN, plays a loud customizable sound on speaker, macOS pops up a persistent alert through a

I have something like this for myself: a server listens for POSTs on LAN, plays a loud customizable sound on speaker, macOS pops up a persistent alert through a Shortcut, and all iOS devices receive an urgent push notification through Pushover. I can hook arbitrary high priority jobs and watchers to it since it only takes an HTTP request to activate.