feat(kibana): add kibana_public_base_url to override server.publicBaseUrl

[Oddly]

The kibana role derives server.publicBaseUrl as <scheme>://<host>:<port>, which is incorrect when Kibana runs behind a reverse proxy on a different host/port (generated report and alerting links point at the node instead of the proxy).

This adds an optional kibana_public_base_url variable, used verbatim when set. The default is empty, preserving the current generated value, so there is no behaviour change for existing users.

Coverage added to the kibana_custom molecule scenario: it sets the override and asserts the verbatim value is rendered and the :5601 form is absent.

Summary by CodeRabbit

• New Features

  • Added support for setting a custom public URL for Kibana.
  • The configured value is used as-is when provided, with a fallback to the automatically generated URL when left unset.

• Bug Fixes

  • Improved Kibana configuration handling to avoid adding an unexpected port to custom public URLs.
  • Expanded verification to confirm the configured URL appears correctly in the generated setup.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5b5a6add-8d79-4350-a512-e4fbb7158b73

📥 Commits

Reviewing files that changed from the base of the PR and between 76f7a50 and 484d17e.

📒 Files selected for processing (4)

• molecule/kibana_custom/converge.yml
• molecule/kibana_custom/verify.yml
• roles/kibana/defaults/main.yml
• roles/kibana/templates/kibana.yml.j2

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📝 Walkthrough

Walkthrough

Adds a kibana_public_base_url role variable that, when set, overrides server.publicBaseUrl in kibana.yml verbatim. The Jinja2 template gains a conditional to use the override or fall back to the computed URL. Molecule tests cover both the variable injection and the rendered output assertion.

Changes

kibana_public_base_url override support

Layer / File(s)	Summary
Variable definition and template conditional roles/kibana/defaults/main.yml, roles/kibana/templates/kibana.yml.j2	Adds kibana_public_base_url default variable (empty, with fallback docs) and replaces the unconditional server.publicBaseUrl assignment with a conditional that uses the override when non-empty.
Molecule converge and verify molecule/kibana_custom/converge.yml, molecule/kibana_custom/verify.yml	Sets kibana_public_base_url: https://kibana.example.com in the converge playbook and adds assertions that kibana.yml contains the verbatim override and does not contain the port-suffixed form.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 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 clearly describes the main change: adding kibana_public_base_url to override server.publicBaseUrl.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/kibana-public-base-url

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