Update metrics.md to included quick start for node.enableMetrics

[cam634]

What type of PR is this?

/kind documentation

What is this PR about? / Why do we need it?

This pr adds documentation that seems to be missing for node.enableMetrics figured this would be important given the metric endpoints are on different ports

How was this change tested?

No test needed docs

Does this PR introduce a user-facing change?

NONE

NONE

[k8s-ci-robot]

Welcome @cam634!

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[k8s-ci-robot]

Hi @cam634. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[torredil]

/ok-to-test

[AndrewSirenko]

Don't worry about the test failures. We're seeing an increase in e2e test flakes, likely due to Kubernetes community releasing K8s 1.32 related components at the moment.

[ElijahQuinones]

/retest

[AndrewSirenko]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AndrewSirenko

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[github-actions]

Code Coverage Diff

This PR does not change the code coverage