Prometheus Monitoring - CPU Usage %

[Bill Zalokostas]

The type sum by(image) (rate(container_cpu_usage_seconds_total{image="my-image-name"}[5m])) * 100 is returning seconds or Mhz? I want to get this CPU usage metric from prometheus and use custom metric in my autoscaler in order to deploy or delete replicas in the slave-node, so I have to Mhz. Is there any solution here?

Thank you in advance

[Ben Kochie]

CPU use is never measured in "Mhz". Linux, and hence containers, only record CPU use in "CPU Seconds", the frequency of the clock is not part of the data.

On Thu, Apr 1, 2021 at 3:11 PM Bill Zalokostas <billzal...@gmail.com> wrote:

The type sum by(image) (rate(container_cpu_usage_seconds_total{image="my-image-name"}[5m])) * 100 is returning seconds or Mhz? I want to get this CPU usage metric from prometheus and use custom metric in my autoscaler in order to deploy or delete replicas in the slave-node, so I have to Mhz. Is there any solution here?

Thank you in advance

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[Julius Volz]

Yeah, that initial expression gives you the CPU usage in percent of a CPU core (not seconds or MHz). So if you have 1 core and it's 100% used, you will get an output value of 100, for 2 fully used cores you would get 200, etc.

It doesn't seem like cAdvisor exposes any clock speed (MHz) metrics, see also https://github.com/google/cadvisor/issues/2354. Though the Node Exporter does (see https://www.robustperception.io/cpu-frequency-scaling-metrics-from-the-node-exporter), but how much sense it makes to combine that with the container-level CPU usage data, I'm not sure.

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Julius Volz

PromLabs - promlabs.com