Just found this
https://nicolargo.github.io/glances/
Glances is a cross-platform system monitoring tool written in Python

It can also be generate it’s own webpage for remote monitoring (if started that way)
Might be a great addon for DietPi
(I did a manual install and it does work on DietPi, just not as a package)
$sudo apt install glances
looks interesting but it seems to require constantly some CPU https://github.com/nicolargo/glances/issues/1834
easy to install. First install Python from dietpi-software and afterwards run following to get all modules
pip3 install --user 'glances[action,browser,cloud,cpuinfo,docker,export,folders,gpu,graph,ip,raid,snmp,web,wifi]'
start the web server
glances -w
cool, there is a shell version too w/o the heavier than usual grind…it works well, expect 3-5% usage while running but it gives you tons of info
How to Install Glances on Debian 11 or 10 - LinuxCapable