Document pitfalls of `backend-protocol`

[VannTen]

What this PR does / why we need it:

Using the backend-protocol has unexpected effect (for us, at least) since many annotations assume HTTP or HTTPS. Explicit this in the docs.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation only

Which issue/s this PR fixes

fixes #7767

How Has This Been Tested?

Documentation only.

Checklist:

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

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@VannTen: This issue is currently awaiting triage.

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[k8s-ci-robot]

Hi @VannTen. 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: VannTen To complete the pull request process, please assign tao12345666333 after the PR has been reviewed. You can assign the PR to them by writing /assign @tao12345666333 in a comment when ready.

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[VannTen]

Also, I wonder if annotations could be made "polymorphic" by looking at the backend-protocol value ? I suppose this could be made in the configuration template (roots/etc/nginx/template/nginx.tmpl if I'm not mistaken ?)

[longwuyuan]

/ok-to-test

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/lifecycle stale

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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