… specifically, the thing to deliver alerts from your servers to your phone or whatever. I’m using Discord, because it doesn’t depend on my own infrastructure, and I can make a private “alerts” channel on my private server. But I’d like to switch to something that’s not Discord. I’m using alertmanager, FWIW.
I use pushover for everything alerting, from home assistant to nagios.
A 1 time payment and you get 10,000 alerts a month
Just be aware that if you’re using the Android client, your phone/tablet will probably at some point put it into deep sleep which will prevent it from displaying notifications. You can (and should) change this in the app settings.