Pushover allows per-message sound settings, so you could configure just alerts from your monitoring to play a sound and send at priority 2 which will bypass your device's quiet settings and repeat to wake you up.
Oh wow, you just got me hooked on a rabbit hole that i can't get out of - but in a good way! :-)
I love these sorts of easter egg-like things! I mean, they're not really easter eggs. But this /uses page, the /now pages, the humans.txt file that someone else mentioned (which i also use on my personal website), and other similar "info broadcast" mechanisms are always so much fun...Because they provide a little trail of breadcrumbs of discovery about people in a neat, old school sort of way. I miss the internet/web of old, and this sort of thing brings all that fun back! Thanks for sharing!
On Android, Pushover is able to (optionally) play notification sounds for high-priority messages through the alarm channel like an alarm app would, so it can bypass the device's mute switch.
You can encrypt notifications that go through Google's FCM and Apple's APNS push notification servers. This is how Pushover works - each notification is encrypted with a device-specific key, sent through the notification servers as an encrypted blob, then the app on the device is woken up and receives the blob, decrypts it, and posts it as a normal notification.
You could. But if you don't need that kind of added complexity and scale (and I don't for personal news updates or IoT device alerts) then why jump through those hoops?
https://pushover.net/api#sounds
https://pushover.net/api#priority2