Add include-endpoint-target-refs option

[fw42]

What this PR does / why we need it:

When updating the dynamic configuration, we would like to have access to the TargetRef object of an endpoint (pod name in particular) in order to build custom logic around this. In the past, this was accessible, but was later removed in #2365.

This PR here introduces an option (defaulting to false to preserve the current behaviour) where users can opt-in to the old behaviour.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

How Has This Been Tested?

Not properly tested yet. Want to get some feedback first whether this has a chance of being accepted.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[linux-foundation-easycla]

• ❌ - login: @fw42 / name: Florian Weingarten . The commit (575c199) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fw42
Once this PR has been reviewed and has the lgtm label, please assign strongjz for approval. For more information see the Kubernetes Code Review Process.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @fw42. Thanks for your PR.

I'm waiting for a kubernetes 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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[fw42]

@ElvinEfendi, since you're apparently not maintaining anymore, can you point me in the right direction as to who to ping on this?

[k8s-ci-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ElvinEfendi]

@ElvinEfendi, since you're apparently not maintaining anymore, can you point me in the right direction as to who to ping on this?

anyone that's already pinged automatically in this PR plus @rikatz

[github-actions]

This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.

[k8s-triage-robot]

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You can:

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• Close this PR with /close

Please send feedback to sig-contributor-experience at kubernetes/community.

/remove-lifecycle frozen

[k8s-triage-robot]

The lifecycle/frozen label can not be applied to PRs.

This bot removes lifecycle/frozen from PRs because:

• Commenting /lifecycle frozen on a PR has not worked since March 2021
• PRs that remain open for >150 days are unlikely to be easily rebased

You can:

• Rebase this PR and attempt to get it merged
• Close this PR with /close

Please send feedback to sig-contributor-experience at kubernetes/community.

/remove-lifecycle frozen