I really want to use this - I run a school student newsletter and would love to be able to see how people are reading it. Unfortunately I'd want to host this on

I really want to use this - I run a school student newsletter and would love to be able to see how people are reading it. Unfortunately I'd want to host this on my own server that I already have set up serving the PDFs with some small PHP scripts and Caddy. Any options for this use case?