It's just metadata in the notification body indicating to the device to ignore silent mode etc.
It's e.g used by Pagerduty [0]. It's just a way to override notification settings.
The software for the systems you mention have this entitlement (or some equivalent), but are otherwise completely unrelated to this.
[0]: https://support.pagerduty.com/main/docs/mobile-app-settings#...
It's just metadata in the notification body indicating to the device to ignore silent mode etc.
It's e.g used by Pagerduty [0]. It's just a way to override notification settings.
The software for the systems you mention have this entitlement (or some equivalent), but are otherwise completely unrelated to this.
[0]: https://support.pagerduty.com/main/docs/mobile-app-settings#...