There's prometheus node exporter which can collect such data from several hosts. You can hook it up with Grafana for neat dashboards and I'm almost sure it also integrates with Homeassistant.
Its not exactly lightweight, but the Netdata integration will get you all of that.
Securing Netdata itself can be a bit of a chore, and then the integration requires creating sensors of interest in your configuration.yaml
file. Have a look, it might be an interesting project if you're up for a challenge.
Curious to hear what others are thinking too.
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