Which solution?

I am totally novice with Prometheus and Grafana, but started to set something up.
Now what I am currently really looking for is a view that gives me the a summary of used disk space + a history aggregated over multiple nodes. The goal is not to check if I am running out of space, it is to follow the usage history, and to see if overall data on disks is increasing or declining.

So my question would be if Prometheus + Grafana still would be the (only) choice. And if that would be the way to go, which Grafana dashboard is there a Grafana dashboard already that has already a display of such a view plus history included?

Theres a Loki and prometheus which are already posted on the forums.

You can custom make the graphs how you want them.