Concepts to write code to monitor running application on the server

Question

Requirement:- I have to write code to monitor all the running applications on the server and give their name as output if it's down.

Research:- During my research I found that:-

1. There are several tools like azure and monito that themselves monitor all the applications but this does not match our requirements.

2. We can write code that can check all the running services on the local desktop or the server and from there we can also check the running status of the required applications and if the status is stopped or sleep then we can easily notify.

3. We can send requests to the deployed URL at some regular interval and if we get a response status rather than 200 then we can notify the user as something is wrong and this particular website is not working.

If anyone can through some light on this and can suggest some more methods or references from their experience, it will be highly appreciated.