docs: inputs: fluentbit-logs: add new input plugin documentation

[eschabell]

• Add pipeline/inputs/fluentbit-logs.md for the new fluentbit_logs input plugin
• Document record format (level and message fields, all level values)
• Note no configuration parameters
• Note event-driven delivery model and 1024-entry queue limit
• Add YAML and classic config examples for stdout and OpenTelemetry output destinations
• Add SUMMARY.md entry alphabetically before Fluent Bit metrics

Fixes #2480

Summary by CodeRabbit

• Documentation
  • Added documentation for the Fluent Bit logs input plugin, explaining how it converts Fluent Bit internal logs into pipeline records with level and message fields. Includes details on event-driven delivery, buffering behavior, and setup examples with OpenTelemetry collector integration.

[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: 660c6214-a84a-4668-a44a-aa013212bdd6

📥 Commits

Reviewing files that changed from the base of the PR and between 21b6f3c and 821df2c.

📒 Files selected for processing (2)

• SUMMARY.md
• pipeline/inputs/fluentbit-logs.md

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📝 Walkthrough

Walkthrough

This pull request adds documentation for a new "Fluent Bit logs" input plugin. It includes a new documentation file describing the plugin's functionality, buffering behavior, and usage examples, along with a navigation entry in SUMMARY.md.

Changes

Cohort / File(s)	Summary
Documentation Navigation SUMMARY.md	Added table of contents entry for the Fluent Bit logs input plugin documentation.
Plugin Documentation pipeline/inputs/fluentbit-logs.md	New documentation page describing the Fluent Bit logs input plugin, including functionality overview, bounded in-memory buffering (1024 entries), record field specifications, and "Get started" examples with stdout and OpenTelemetry collector configurations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related issues

• Doc updates needed from 1 Mar - 18 Mar (based on code updates) #2477: Appears to be addressing the same objective of documenting the Fluent Bit logs input plugin with identical file additions (pipeline/inputs/fluentbit-logs.md and SUMMARY.md entry).

Suggested labels

4.2.1

Suggested reviewers

• cosmo0920

Poem

🐰 A doc for logs so bright and clear,
Fluent Bit whispers now we hear,
With buffers bounded, records neat,
This plugin makes the pipeline sweet!
hippity-hop, the docs take flight 📖✨

🚥 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 and concisely describes the main change: adding new documentation for the fluentbit-logs input plugin.
Linked Issues check	✅ Passed	The PR fully meets all coding requirements from issue #2480: new documentation file created, plugin behavior documented, config options noted, and SUMMARY.md updated.
Out of Scope Changes check	✅ Passed	All changes are directly aligned with issue #2480 requirements; no extraneous modifications detected beyond documenting the fluentbit_logs plugin.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

📝 Coding Plan

• Generate coding plan for human review comments

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[eschabell]

@patrick-stephens , @lecaros and @cosmo0920 review needed for new input plugin doc please!