Some time ago I've made a simple stats-page for my little pi-node,
just the basic info like connections, mempool, cpu/memory-load, traffic,
take a look urself.
I'm not much of an expert though, it was more like constant trial and error,
but I also wrote a
howto on how I've done it.
Might have to switch some commands here and there and probably even skip some parts (like installing a webserver, if you've already got one) depending on your setup.
This was just made for raspbian, but I see no reason why it shouldn't work on other systems too.