The average network traffic received, per second, over the last minute (in bytes) The filesystem space available to non-root users (in bytes) The average amount of CPU time spent in system mode, per second, over the last minute (in seconds) Once the Node Exporter is installed and running, you can verify that metrics are being exported by cURLing the /metrics endpoint: curl You should see output like this: # HELP go_gc_duration_seconds A summary of the GC invocation durations. INFO Listening on :9100 source="node_exporter.go:111" INFO - boottime source="node_exporter.go:97" INFO Enabled collectors: source="node_exporter.go:90" You should see output like this indicating that the Node Exporter is now running and exposing metrics on port 9100: INFO Starting node_exporter (version=0.16.0, branch=HEAD, revision=d42bd70f4363dced6b77d8fc311ea57b63387e4f) source="node_exporter.go:82" Once you've downloaded it from the Prometheus downloads page extract it, and run it: wget */node_exporter-*.* The Prometheus Node Exporter is a single static binary that you can install via tarball. You can also parse the output of top -n1 | grep -i cpu to get the cpu usage, but it only samples for half a second on my linux box and it was way off during heavy load.NOTE: While the Prometheus Node Exporter is for *nix systems, there is the Windows exporter for Windows that serves an analogous purpose. I run similar code in a loop within a go routine, then I access the cpu usage when I need it from other go routines.
You'll notice that I wait 3 seconds between samples to match top's output, but I have also had good results with 1 or 2 seconds. I sample the /proc/stat file just like tylerl recommends. Here is a slimmed down version of my solution that answers your specific question. I had a similar issue and never found a lightweight implementation.
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