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Gotify
A self-hosted push notification server: alerts land on a phone the moment something needs attention.
Gotify is a lightweight self-hosted server that other services push notifications through, landing instantly on a phone via its own app, the same instant-alert feel as a commercial push service, minus a third party relaying every message.
It's the quiet plumbing behind a lot of the alerts in this setup: a service going down, a backup finishing, a door sensor tripping, all routed here first.