This mod is outdated, may no longer work, and I recommend to use the one released by LinuxServer.io here.
This mod adds Audnex.us client plugin to Plex, to be downloaded/updated during container start.
In plex docker arguments, set an environment variable DOCKER_MODS=ghcr.io/kahooli/plex-audnexus
If adding multiple mods, enter them in an array separated by |, such as DOCKER_MODS=ghcr.io/kahooli/plex-audnexus|linuxserver/mods:plex-mod2