I tried it, couldn't get HTTPS to work.

Also my console gets spammed with:

04:43:20.160 [warning] invalid 'event' parameter: size: 6 value: "paused"

but it seems to work. I would've liked to see HTTP stats too but I guess UDP is fine (though I have it disabled)

The "paused" event is part of BEP 21. Clients send it to the tracker to let it know that the client is still incomplete, but won't download anymore. For example, because a user only wants some files from the torrent. Readme of the project shows that support for BEP 21 is not implemented.

Telemetry for the HTTP side is in my ToDo list yes, since I'm using a 3rd party library for the webserver I still need to figure out how to do it right. For HTTPS to work you need to provide a valid certificate path in :https_keyfile but right now I would recommend sticking Caddy or Nginx in front of the tracker if you want HTTPS. I have certbot integration planned but is not a priority since most of the torrent peers use UDP.