Enable Prometheus metrics without service monitor

[prashcr]

Issue

#3244

Description

Add a metrics.enabled variable in the Helm chart to create the Prometheus metrics service independently of the service monitor. This enables monitoring for Kubernetes clusters that are using alternative Prometheus collectors and don't have Prometheus Operator/ServiceMonitor CRD installed.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested with helm lint, helm template
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: prashcr / name: Prashanth Chandra (bcbb386)

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[oliviassss]

@prashcr, sorry for being late. can you please rebase the PR? I don't think it necessary to bump up the version in Chart.yaml, we will change the version when we are releasing.

Otherwise, the change looks good to me.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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[prashcr]

@oliviassss No worries, updated.

[oliviassss]

/lgtm
/assign @M00nF1sh

[prashcr]

Could I get an approval?

[k8s-ci-robot]

PR needs rebase.

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/lifecycle stale

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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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/close

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[Andrea-Gallicchio]

/reopen

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