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The most critical use cases are in my opinion:

time critical informations before the event

time critical informations on the event

not time critical discussions

In both cases time for communication is critical. I have been considering

needs to be availible for android and ios
just a mobile app with MQTT that connects to a MQTT server and subscribes to the relay. the relay can send messages out to every subscriber, the app will show them as push notification
would be nice if the app app is availible in the app stores.
the app should be less than 10mb in size (that way people will not remove it to regain space)
the app should be as simple as possible (autostart on reboot of the phone, just shows a screen with recent messages)
The app could be a Web-App as well, that way we would have all logic on the server and the app really just pushes the notifications and is a quick-link to recent messages.

Hey, i guess what you're searching is https://ntfy.sh.

its sends and receives notifcations via websocket.
they've an app for android, ios and web, all can send and receive notifications
different topics, markdown formatting, attachments
you can set different alert priorities, the highest one beeps even in do-not-disturb and the lowest sends only a little notification
i'm using it for my personal prometheus alerts and i can say it's really reliable
Apache 2.0 and GPLv2 licensed and is really simple to self-host

if you have questions, feel free to reach out to me: https://matrix.to/#/@fossdd:matrix.org

There are a lot of chat solution that can be scripted
Don't invent the wheel again
Probably use a notify group in jabber matrix .... that is splittend from normal channels for better filtering an notification