How to create a universal monitoring system?

Question

Monitoring

Help, please, to understand. You need a monitoring system that supports modules / plugins. For example, a plugin for SQL server, Sharepoint, etc.

Answer 1

www.zabbix.com

Answer 2

you will learn how analogues of the same zabbix, nagios, etc. work.
It is strange that when trying to make an analogue of these programs, you did not study them.
install them, set up monitoring of different servers/services, compare, make a list of what you liked about them and what you didn't.
If something specific is not clear, ask questions.
Z.Y. It seems to me that there is no specifics in your question, so you will not get clear answers.