in_nginx: update NGINX exporter metrics documentation

[eschabell]

• Add missing scrape_interval parameter (default: 5s)
• Add TLS/SSL configuration section
• Add info hint about metrics pipeline separation
• Alphabetize and lowercase config parameter names
• Fix NGINX config comment syntax (// → #)
• Standardize indentation to 2 spaces in .conf examples
• Minor style improvements for consistency with other input docs

Summary by CodeRabbit

• Documentation
  • Updated NGINX metrics input documentation with standardized configuration parameter naming conventions.
  • Added new configuration sections for TLS/SSL and scrape interval settings.
  • Enhanced example configurations and improved clarity in setup instructions.

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[coderabbitai]

Walkthrough

This PR updates the NGINX metrics input documentation, renaming configuration keys from camelCase to lowercase with underscores (Host→host, Port→port, Status_URL→status_url, Nginx_Plus→nginx_plus, Threaded→threaded), adding new keys like scrape_interval and status_url, introducing a TLS/SSL section, and revising examples and descriptions for consistency.

Changes

Cohort / File(s)	Summary
NGINX Input Documentation pipeline/inputs/nginx.md	Renamed configuration keys to lowercase with underscores; added scrape_interval and TLS/SSL section; updated YAML/CONF examples and command snippets to reflect new parameter names; improved descriptive text and example captions for clarity

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Verify configuration key naming consistency across all code examples and descriptions
• Confirm all YAML/CONF snippets accurately reflect the new key names
• Validate that the TLS/SSL section guidance is complete and accurate

Poem

🐰 Keys renamed, underscores flow,
Configuration docs now glow,
NGINX settings, clear and bright,
Documentation set just right! ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: updating NGINX exporter metrics documentation, matching the pull request's primary objectives of adding parameters, configuration sections, and improving documentation consistency.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e254c1b and 9bcec79.

📒 Files selected for processing (1)

• pipeline/inputs/nginx.md (9 hunks)

🔇 Additional comments (1)

pipeline/inputs/nginx.md (1)

5-9: Well-executed documentation update across all segments.

The documentation changes comprehensively address all stated PR objectives:

• Info hint (lines 5–9): Clear explanation of metrics pipeline separation with appropriate formatting.
• Configuration table (lines 15–22): Parameters correctly alphabetized (host, nginx_plus, port, scrape_interval, status_url, threaded), using lowercase with underscores, with complete descriptions and defaults.
• TLS/SSL section (lines 24–26): Concise section with appropriate reference to transport security documentation.
• Comment syntax (lines 41, 58–62): NGINX config comments correctly changed from // to #.
• YAML examples (lines 88–104, 132–144): Properly use lowercase snake_case parameter names (host, port, status_url, nginx_plus, scrape_interval).
• CONF examples (lines 110–121, 150–161): Correctly maintain PascalCase for CONF format (Host, Port, Status_URL, Nginx_Plus, Scrape_Interval), which is the standard Fluent Bit convention.
• Indentation: Consistently standardized to 2 spaces across all code blocks.
• scrape_interval parameter: Properly added with default value of 5s and clear description.

All examples remain functionally consistent and the parameter naming conventions are correctly differentiated by format (YAML vs. CONF). Minor text refinements enhance clarity.

Also applies to: 15-26, 30-46, 52-67, 74-82, 88-164, 174-174

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[eschabell]

AI review accepted, merging.