How to monitor api?

Question

PHP

Good time. There is a rest full api written in php. The question has arisen. How to monitor it? That is: availability check, number of calls to a certain method in api, etc.
Thanks in advance.

Answer 1

In each method, keep a detailed log of its work.
Implement a test method (echo) to check availability. Method to call from a service running on another hosting. Make sure that check entries appear regularly in the api logs.