If you want some ideas, there are plenty of examples here:

https://old.reddit.com/r/selfhosted/search?sort=new&restrict_sr=on&q=flair%3APersonal%2BDashboard

The benefit is, I dont need to open a webpage (less data usage or if you are in a slow internet area) or login to a service to add media

https://github.com/Waterboy1602/Addarr

I use this all the time instead of opening Radarr and Sonarr

Definitely learned a lot.

This app would be useful if you have more than one device. If you run the monitoring application on the same device as the services you are monitoring and if the device goes down, you wouldn’t get a notification, right?