topic Re: Kubernetes/OpenShift CPU Throttling - What is the best metric? in Container platforms

Kubernetes/OpenShift CPU Throttling - What is the best metric?

crabbylou — Tue, 19 Sep 2023 07:46:34 GMT

I am starting to grab more container-level statistics within Kubernetes/OpenShift. Someone mentioned to me about the importance of measuring CPU throttling. What is the best metric in DT for measuring CPU throttling?

I am already grabbing container CPU, millicores, millicores and maximum. Is there an actual statistic for the percentage or degree of throttling?

Any help would be appreciated.

Thanks,

Lou

Re: Kubernetes/OpenShift CPU Throttling - What is the best metric?

natanael_mendes — Mon, 18 Sep 2023 19:28:41 GMT

Yes exist, the metric is literally CPU throttling haha

"The CPU throttling metric tells you how long the application was throttled, so you can determine where more CPU time would have been needed for processing. This usually happens when the containers don't have enough CPU resources (limits) in the workload definition. This might affect the performance of the processes and applications running inside the containers."

Take a look on this documentation page

https://www.dynatrace.com/support/help/platform-modules/infrastructure-monitoring/container-platform-monitoring/kubernetes-monitoring/monitor-workloads-kubernetes

You can also see the number of running pods versus desired pods for every cloud application.

Re: Kubernetes/OpenShift CPU Throttling - What is the best metric?

Mizső — Tue, 19 Sep 2023 21:42:15 GMT

Hi @crabbylou,

I usually use these ones at clinets:

( builtin:containers.cpu.throttledMilliCores:avg:parents:parents:splitBy("dt.entity.cloud_application_instance","dt.entity.cloud_application"):sum

/ builtin:containers.cpu.usageMilliCores:avg:parents:parents:splitBy("dt.entity.cloud_application_instance","dt.entity.cloud_application"):sum

* 100

)

:splitBy("dt.entity.cloud_application_instance","dt.entity.cloud_application")

:setUnit(Percent)

:sort(value(avg,descending))

:limit(5)

builtin:containers.cpu.throttledMilliCores

:filter(series(avg,gt,10))

:parents:parents:splitBy("dt.entity.cloud_application_instance","dt.entity.cloud_application")

:avg

:auto

:sort(value(avg,descending))

:limit(5)

I hope it helps.

Best regards,

Mizső