OCPSTRAT-2915: CPU-based control plane autoscaling

[csrwng]

Summary

• Adds enhancement proposal for extending HyperShift resource-based
  control plane autoscaling to consider CPU usage in addition to memory
• Introduces per-size resource fraction overrides in
  ClusterSizingConfiguration, allowing different fractions for
  different cluster sizes
• Sizing decision uses the maximum of CPU and memory VPA
  recommendations to prevent under-provisioning on either dimension

Test plan

• Review enhancement content for completeness
• Verify API extension design is backward compatible
• Confirm open questions are addressed before implementation

🤖 Generated with Claude Code

[openshift-ci-robot]

@csrwng: This pull request references OCPSTRAT-2915 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the feature to target the "4.22.0" version, but no target version was set.

Details

In response to this:

Summary

• Adds enhancement proposal for extending HyperShift resource-based
  control plane autoscaling to consider CPU usage in addition to memory
• Introduces per-size resource fraction overrides in
  ClusterSizingConfiguration, allowing different fractions for
  different cluster sizes
• Sizing decision uses the maximum of CPU and memory VPA
  recommendations to prevent under-provisioning on either dimension

Test plan

• Review enhancement content for completeness
• Verify API extension design is backward compatible
• Confirm open questions are addressed before implementation

🤖 Generated with Claude Code

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@csrwng: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/markdownlint	987afae	link	true	/test markdownlint

Full PR test history. Your PR dashboard.

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