docs: update otel documentation

[toredash]

What this PR does / why we need it:

Update otel relevant docs to reflect what's actually current.

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

Which issue/s this PR fixes

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.

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[k8s-ci-robot]

This issue is currently awaiting triage.

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[k8s-ci-robot]

Hi @toredash. 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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[rikatz]

/assign @esigo
/ok-to-test

[cpanato]

/lgtm

/hold for more eyes

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, toredash

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[esigo]

Thanks for the PR.
I had a few suggestions.

[esigo]

I'd rather keep the sample configmap as it is. It would make sense those who visit this page, also know about the options before going through the configs on the other pages.

[k8s-ci-robot]

PR needs rebase.

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[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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/remove-lifecycle frozen

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[christophe-kamphaus-jemmic]

Related issue: #10966
As mentioned by @kalingaru48 on #10966 (comment) this file should document that once enabled opentelemetry is active for all traffic going through this nginx.

[k8s-ci-robot]

@toredash: 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-ingress-nginx-boilerplate	580fd60	link	true	/test pull-ingress-nginx-boilerplate
pull-ingress-nginx-codegen	580fd60	link	true	/test pull-ingress-nginx-codegen
pre-ingress-nginx-codegen	580fd60	link	true	/test pre-ingress-nginx-codegen
pre-ingress-nginx-boilerplate	580fd60	link	true	/test pre-ingress-nginx-boilerplate
pre-ingress-nginx-lua-test	580fd60	link	true	/test pre-ingress-nginx-lua-test

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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