KEP-5207: Graduate metrics.k8s.io to Stable

[tico88612]

• One-line PR description: Graduate metrics.k8s.io to Stable

• Issue link: API for internal metrics #5207

• Other comments:

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tico88612
Once this PR has been reviewed and has the lgtm label, please assign dgrisonnet, kannon92 for approval. For more information see the Code Review Process.

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Needs approval from an approver in each of these files:

• keps/prod-readiness/OWNERS
• keps/sig-instrumentation/OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[k8s-ci-robot]

@tico88612: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-enhancements-test	6f9be4d	link	true	/test pull-enhancements-test
pull-enhancements-verify	6f9be4d	link	true	/test pull-enhancements-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[rexagod]

/assign @rexagod @dgrisonnet
/triage accepted