The reason this reminds you of Relativity is because that’s what it is with modifications.

Credit where credit is due: https://github.com/relativty/Relativty

He basically built (and advanced) Relativity’s open source headset.

Graphene could sandbox the integrity check, just like they do with the Play Store.

Set of cron jobs that check services, then send a Matrix message if there’s an issue.

For the cron jobs, I pipe stderr to another script that watches those and does the same.

If all fails, and internet is unavailable and the router crashes, a Pi will toggle a relay, cutting and resupplying power.