collector/mdadm: Support RAID metrics

prometheus / node_exporter

Exporter for machine metrics

https://prometheus.io/

Apache License 2.0

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Open rexagod opened 1 month ago

rexagod commented 1 month ago

Use sysfs for RAID stats. Also added tests for the collector.

Fixes: #842

rexagod commented 1 week ago

Not sure what's causing the error here, the logs seem okay (no level=error lines)?