I think prometheus + grafana might be what you are looking for. In combination with loki grafana can also be used for viewing log messages.

I doubt many are looking for 8-bay DAS, anything larger than 4-bay you are probably better off with NAS. Many DAS have limited RAID support, which can make having more drives more risky.

But i already have a computer that works well enough, isnt it a waste to completly replace it with a nas?

I already did that but nothing changed, stillthankqs for the input!