VPA: Add tests for the recommender metrics utilities

[chansuke]

trafficstars

What type of PR is this?

/kind feature

What this PR does / why we need it:

add tests for the recommender metrics utilities

Which issue(s) this PR fixes:

Fixes #8128

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[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: chansuke Once this PR has been reviewed and has the lgtm label, please assign omerap12 for approval. For more information see the Code Review Process.

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• vertical-pod-autoscaler/OWNERS

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[omerap12]

/triage accepted

[omerap12]

cc @voelzmo

[k8s-triage-robot]

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/lifecycle stale

[adrianmoisey]

Whoops, this one slipped through the cracks, sorry! I left a nit, but I think it's good so far

[omerap12]

/remove lifecycle/stale

[omerap12]

/remove-lifecycle stale

[k8s-ci-robot]

PR needs rebase.

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[k8s-ci-robot]

@chansuke: 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-autoscaling-e2e-vpa-actuation	c6aa674ad78e6df29c9bed61e0fd8c7375ea6ab9	link	true	/test pull-autoscaling-e2e-vpa-actuation
pull-autoscaling-e2e-vpa-updater	c6aa674ad78e6df29c9bed61e0fd8c7375ea6ab9	link	true	/test pull-autoscaling-e2e-vpa-updater
pull-autoscaling-e2e-vpa-admission-controller	c6aa674ad78e6df29c9bed61e0fd8c7375ea6ab9	link	true	/test pull-autoscaling-e2e-vpa-admission-controller
pull-autoscaling-e2e-vpa-recommender	c6aa674ad78e6df29c9bed61e0fd8c7375ea6ab9	link	true	/test pull-autoscaling-e2e-vpa-recommender

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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