I am setting up my first jellyfin server via docker, and I am offered the option to either use TMDB or OMDB. I have jellyfin on a LAN-connected device w/o VPN connection, and I am concerned queries to those DBs with file names of torrented files can get tracked and reported to my ISP. Could that be the case? And if so what to do about it? Are there more privacy-preserving metadata services than others?
Yes. You have to mount a port on the Gluetun container instead of the jellyfin container. As an extreme example, here is my docker-compose for my *arr apps and qbit torrent behind gluetun with traefik as a reverse proxy. I have sanitized this to remove any private info, and as such one or two necessar lines from Gluetun are missing. Do not try to copy/paste this.
gluetun: image: qmcgaw/gluetun container_name: gluetun