[cl2] pass through a couple of prometheus parameters

[dims]

Needed for use by scalability jobs - kubernetes/kops#15963

[dims]

/assign @michelle192837 @jbpratt

[jbpratt]

/lgtm

/hold

[k8s-ci-robot]

@dims: 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
pull-kubetest2-gce-legacy-build-up-down	0f46a30	link	false	/test pull-kubetest2-gce-legacy-build-up-down

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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[dims]

/skip

https://testgrid.k8s.io/sig-testing-canaries#pull-kubetest2-gce-legacy-build-up-down&width=20 shows that the new job is still under construction

[jbpratt]

/approve
/unhold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, jbpratt

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