Prometheus on its own is nice, but the graphs are not that great. We should setup Grafana on top of that instead. Grafana is a pain in the bottom to install in Debian: there are upstream packages, but they are [a mess](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=835210#42) so my approach has been to use Docker so far. I guess we can use the test server for this for now. note there is a puppet module for grafana, which supports deploying both with the upstream debian package and docker: https://forge.puppet.com/puppet/grafana