The node exporter has metrics about the ARP table.
Reliable Insights
A blog on monitoring, scale and operational Sanity
Linux provides scheduling metrics in /proc/schedstat, which the node exporter uses.
Modern CPUs don't run at one constant frequency.
Prometheus 2.20 added a group aggregator. What is it for?
/proc/mdstat is another of the files that the node exporter exposes as metrics.
The node exporter exposes the current machine time.
As of 1.0, the node exporter has experimental support for TLS. This can be hooked up to Letsencrypt.
The node exporter includes metrics about the Linux connection tracking tables.
To avoid weirdness, write your files atomically.
The node exporter provides kernel file descriptor metrics.
