OCPBUGS-52341: Add CPUPSIPressureUtilization ActualUtilizationProfile

[tiraboschi]

CPU PSI pressure as measured by the Kernel is not able to discriminate self imposed pressure due to CPU throttling on CPU limited containers from pressure caused by resource contention with other neighbors.

See: kubernetes/enhancements#5062

In order to filter out evident false positives, we can introduce a new ActualUtilizationProfile that is consuming CPU PSI pressure value only when the actual average CPU utilization on the node is above a certain threshold (70%), otherwise 0.
This is not a systematic solution but a mitigation.

Fixes: https://issues.redhat.com/browse/OCPBUGS-52341

[ingvagabund]

One nit :)

[openshift-ci-robot]

@tiraboschi: This pull request references Jira Issue OCPBUGS-52341, which is invalid:

• expected the bug to target the "4.19.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

CPU PSI pressure as mesured by the Kernel is not able to discriminate self imposed pressure due to CPU throttling on CPU limited containers from pressure caused
by resource contention with other neighbors.
See: kubernetes/enhancements#5062 In oder to filter out evident false positives,
we can introduce a mew ActualUtilizationProfile
that is consuming CPU PSI pressure value only when the actual average CPU utilization on the node is above a certain threshold (70%), otherwise 0.
This is not a systematic solution but a mitigation.

Fixes: https://issues.redhat.com/browse/OCPBUGS-52341

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[ingvagabund]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ingvagabund, tiraboschi

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[ingvagabund]

/jira refresh

[openshift-ci-robot]

@ingvagabund: This pull request references Jira Issue OCPBUGS-52341, which is valid.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.19.0) matches configured target version for branch (4.19.0)
• bug is in the state POST, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact:
/cc @kasturinarra

In response to this:

/jira refresh

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[openshift-ci]

@tiraboschi: all tests passed!

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[openshift-ci-robot]

@tiraboschi: Jira Issue OCPBUGS-52341: All pull requests linked via external trackers have merged:

• openshift/cluster-kube-descheduler-operator#459

Jira Issue OCPBUGS-52341 has been moved to the MODIFIED state.

In response to this:

CPU PSI pressure as measured by the Kernel is not able to discriminate self imposed pressure due to CPU throttling on CPU limited containers from pressure caused by resource contention with other neighbors.

See: kubernetes/enhancements#5062

In order to filter out evident false positives, we can introduce a new ActualUtilizationProfile that is consuming CPU PSI pressure value only when the actual average CPU utilization on the node is above a certain threshold (70%), otherwise 0.
This is not a systematic solution but a mitigation.

Fixes: https://issues.redhat.com/browse/OCPBUGS-52341

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.