Graduate external.metrics.k8s.io to stable

[rexagod]

• One-line PR description: "external.metrics.k8s.io" has been in beta longer than we'd hoped it to be, but this gradutes it to stable as it's been used extensively in production environments in the ecosystem.

• Issue link: Graduate external.metrics.k8s.io to stable #5271

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/lifecycle stale

[rexagod]

Pending review.

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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@rexagod: 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	21e3173	link	true	/test pull-enhancements-test
pull-enhancements-verify	21e3173	link	true	/test pull-enhancements-verify

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