allow setting of Deluge address via environment variable DELUGE_HOST

[jangrewe]

add Dockerfile

Run it like this:

docker run -e "DELUGE_HOST=172.17.0.1" -v /etc/deluge:/root/.config/deluge/ -p 9354:9354 registry.example.com/deluge_exporter:latest

[tobbez]

Code looks good as far as I can tell (don't use docker much).

Please split the commit into one for each distinct change (one for DELUGE_HOST support, one for the Dockerfile).

Or would you prefer if I just split it myself and merged it?

[jangrewe]

You can split it if you want, i didn't plan on maintaining an long term fork. ;-)
Could you also sign up with hub.docker.com to have this image built automatically on push, so that there's an official one?

And a bit off-topic, but: what do you think of merging all the deluge_libtorrent_*_download_bytes_total metrics into a single deluge_libtorrent_download_bytes_total{type="*"} metric (same for the upload metrics, of course), so using labels instead of separate metrics? I guess that's a bit more Prometheus-style ;-)

[tobbez]

There's now an image on docker hub.

The upload and download metrics have also been consolidated (ffa8b29).

[jangrewe]

Great, thank you!