I use RRDTool to track system temps and fan speeds.

I am a very new unraid user, and have cobbled together a system from older part of previous systems.

Specifically an MSI B450 Tomahawk MB with 32gb, Ryzen 5 2600x.
I really wanted to make this a quiet system, so wanted to keep the fan speed very low, or stopped, if possible.

To track drive temps, cpu and system chip temp, I started just logging to a text file.

I remembered about RRDTool from my system admin days, and had used it many yers ago in weather station I made.
It's really is fantastic tool, and one thing led to another, and I ended up building out a Docker which can reasonably track any numeric data source, and produce graphs. I put the graphs in a share on the NAS and also present them via a simple web server from the Docker.

I have attached an example of the graphs it produces, which show the disk temp with quite a lot of variation, as I was stopping the array fan completely, in the end I just left the lower speed to just above stopped, and the temps really flatten out. As it's a 140mm fan, still very quiet at ~600rpm.

As this system can track anything numeric, I might extend to disk io, space, erros, etc

Anyway, I'm quite happy with my solution, it was fun to make, and a learn a bit about unraid on the way.

If anyone is curious, you can find the project on my github, and if there any significant interested I would look into making a bit more polished and a proper Community App docker.

https://github.com/mattjoyce/unraid-rrdtool