Tracking Port Usage - eviltoast

hey all, maybe my Google-Fu is glitching tonight, but what, if anything, do y’all use to track port usage in your docker containers? I know I can browse through Portainer, or grep some data out of my docker compose files etc, but I am hosting things on 3 different machines through a single reverse proxy, and I am just looking for an easy way to trace what ports are in use.

Ideally this would be some sort of container that can gather this data, but looking for recommendations

thanks

app