docs: inputs: opentelemetry: update metrics HTTP1/JSON support status and classic config examples

[eschabell]

• Update the transport protocol support matrix to reflect that HTTP/1.1 JSON is now Stable for metrics, added in commits 4a844c98b, f90bf0d7a, and e8ab3ab62
• Fix classic .conf example to use Title_Case config parameter keys

Fixes #2496

Summary by CodeRabbit

Release Notes

• Documentation
  • Updated OpenTelemetry support matrix: Metrics now marked as Stable for HTTP1/JSON transport
  • Fixed configuration example formatting with corrected field naming conventions

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 65e33fa5-6098-4093-b2fe-1e0409faec6e

📥 Commits

Reviewing files that changed from the base of the PR and between 55086ff and 8bcd364.

📒 Files selected for processing (1)

• pipeline/inputs/opentelemetry.md

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📝 Walkthrough

Walkthrough

This pull request updates the OpenTelemetry input documentation by marking Metrics as Stable for HTTP1/JSON in the support matrix, reflecting newly implemented functionality. Additionally, configuration field casing in the fluent-bit.conf example snippet is standardized to capitalized format for consistency.

Changes

Cohort / File(s)	Summary
OpenTelemetry Documentation pipeline/inputs/opentelemetry.md	Updated support matrix to mark Metrics HTTP1/JSON as Stable (previously Unimplemented). Corrected configuration field casing in fluent-bit.conf example from lowercase to capitalized format (name→Name, listen→Listen, port→Port, match→Match).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Updated and fixed opentelemetry input plugin options configuration table. Fixes #2152. #2153: Modifies the same OpenTelemetry input documentation file, expanding and refining configuration options and code examples alongside this support matrix update.

Suggested reviewers

• patrick-stephens
• cosmo0920

Poem

🐰 The matrix glows with updates bright,
From unimplemented to stable light,
Configuration fields now stand tall and proud,
Capitalized and clear for the whole crowd! ✨

🚥 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 accurately summarizes the main changes: updating metrics HTTP1/JSON support status and fixing config examples, both of which are reflected in the changeset.
Linked Issues check	✅ Passed	The PR addresses issue #2496 by updating the support matrix to mark HTTP1/JSON metrics as Stable and fixing the config example casing, fulfilling all stated coding requirements.
Out of Scope Changes check	✅ Passed	All changes are scoped to the single documentation file and directly address the linked issue requirements without introducing unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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• Create PR with unit tests

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[eschabell]

@coderabbitai review

[coderabbitai]

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[eschabell]

@patrick-stephens ready for review!