1. We don’t know that the toilet has this sensing capability.
2. If it does, the actual fix is the same as if it were a regular toilet.

This just isn’t an issue that needs technology as a solution.

Chrome is not a system app on android.

How do the guests flush the toilet without the app? They have to ask you?

This makes zero sense. If it’s clogged, you’d know beforehand when you look in the bowl. Why the would anyone need a notification for that?

The ONLY utility that I could see here is if the notification logged who did the clogging so you could give them shit.