Very light, looks good and is fast. I have it running as a docker instance on my unraid server (which runs this website, and a couple of other docker instances).
If you want to show extra info about containers / docker running on your host add the following host mappings;
container <- host
/var/run/docker.sock <– /var/run/docker.sock
/host/proc <– /proc
/host/sys <– sys
Lots of metrics, check out the website here – https://github.com/firehol/netdata