[zwetan]

Yep, I use Google Analytics

server-side you can track using the measurement protocol

few years ago I did a prototype test with PHP, example here https://pastebin.com/PQCRcJXq

with something like Slim PHP you can add a middleware and automatically track everything, but you can also customize on a needed basis

I use the same logic with different PL on different backends etc.

for a starter it is cheap to implement and put in place, and cover almost everything