https://github.com/firehol/netdata

It looks like a thing that stores and visualises "metrics".

But it looks like it runs only upon a single host, which makes it less interesting than collectd/prometheus/etc, even if the visuals look a little nicer than grafana, etc.

I certainly wouldn't have the patience to open ten pages if I wanted to see the stats on ten hosts. I want all my metrics in one place - so I can graph "top five busiest hosts", etc.