add doc about ingress-nginx otel

[woodgear]

Summary by CodeRabbit

• Documentation
  • Added comprehensive guide on enabling, verifying, and disabling OpenTelemetry tracing for Ingress NGINX (v4.3.x+), including configuration patching and reconciliation verification steps.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 67177261-4012-48fb-a3c0-4859232dd7d6

📥 Commits

Reviewing files that changed from the base of the PR and between 5129fdb and 60368a4.

📒 Files selected for processing (1)

• docs/en/solutions/How_to_Enable_OpenTelemetry_for_Ingress_NGINX.md

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Walkthrough

This PR adds a user guide documenting how to enable, verify, and disable OpenTelemetry tracing for the ACP Ingress NGINX controller (v4.3.x+). The guide provides step-by-step kubectl commands to patch the IngressNginx custom resource, validate successful reconciliation and module loading, and remove the feature when needed.

Changes

OpenTelemetry Ingress NGINX User Guide

Layer / File(s)	Summary
Enable OpenTelemetry docs/en/solutions/How_to_Enable_OpenTelemetry_for_Ingress_NGINX.md	Document metadata and Chapter 1 instructions for identifying the IngressNginx resource, patching spec.controller.config with OpenTelemetry and OTLP endpoint/sampler/operation-name settings, and confirming expected ConfigMap keys and ownership.
Verify and disable OpenTelemetry docs/en/solutions/How_to_Enable_OpenTelemetry_for_Ingress_NGINX.md	Chapter 2 commands to verify IngressNginx reconciliation status and confirm NGINX/OpenTelemetry module loading via kubectl exec with expected log/config snippets. Chapter 3 shows how to disable OpenTelemetry by patching enable-opentelemetry to "false" and describes the resulting NGINX reload behavior.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A guide hops into the warren,
With steps to trace through Nginx chains,
Enable, verify, disable—
Clear pathways through observability plains! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'add doc about ingress-nginx otel' directly and accurately describes the main change: adding documentation about OpenTelemetry support for Ingress NGINX.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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