docs: administration: monitoring: fix fluentbit_hot_reloaded_times metric type and unit

[eschabell]

• Fix fluentbit_hot_reloaded_times metric type from gauge to counter in the first Prometheus metrics table (reflects source change from cmt_gauge_create to cmt_counter_create in src/flb_metrics.c)
• Fix fluentbit_hot_reloaded_times unit from seconds to times in the second metrics table
• Add /api/v2/health endpoint to the HTTP API endpoints table
• Update /api/v2/reload entry to document 405 Method Not Allowed response with Allow: GET, POST, PUT header for unsupported methods

Fixes #2488

Summary by CodeRabbit

• Documentation
  • Clarified REST API monitoring endpoints for /api/v2 health checks and reload operations with HTTP response codes and headers
  • Corrected Prometheus metrics definitions to accurately reflect metric types and units for monitoring

[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: 1c0c8ea5-e452-4997-9ab7-10989213575d

📥 Commits

Reviewing files that changed from the base of the PR and between 21b6f3c and f3f3736.

📒 Files selected for processing (1)

• administration/monitoring.md

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📝 Walkthrough

Walkthrough

Documentation updates to the REST API monitoring table and Prometheus metrics definitions in administration/monitoring.md. Added /api/v2/health endpoint documentation, clarified /api/v2/reload HTTP method support and 405 error behavior, and corrected the fluentbit_hot_reloaded_times metric type from gauge to counter with unit corrected from seconds to times.

Changes

Cohort / File(s)	Summary
Documentation Updates administration/monitoring.md	Added /api/v2/health endpoint entry with JSON response fields and HTTP 200/500 semantics; expanded /api/v2/reload with supported methods (GET, POST, PUT) and 405 Method Not Allowed behavior; corrected fluentbit_hot_reloaded_times Prometheus metric type from gauge to counter and unit from seconds to times.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• docs: monitoring: document undocumented metrics and fix tables #2378 — Both PRs modify fluentbit_hot_reloaded_times metric documentation (type, unit, and table formatting).
• docs: monitoring: fix hot_reloaded_times metric type #2383 — Both PRs make identical corrections to the fluentbit_hot_reloaded_times metric type and unit definitions.

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰 A rabbit hops through docs so fine,
Metrics gleam and endpoints align,
Health checks flow with counters true,
405 errors bid adieu—
Clarity counts in every line! 📝

🚥 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 directly matches the main changes: fixing fluentbit_hot_reloaded_times metric type and unit corrections in monitoring documentation.
Linked Issues check	✅ Passed	All three coding requirements from issue #2488 are addressed: /api/v2/health endpoint added, fluentbit_hot_reloaded_times type changed from gauge to counter, unit corrected from seconds to times, and /api/v2/reload 405 behavior documented.
Out of Scope Changes check	✅ Passed	All changes in the pull request directly align with requirements in linked issue #2488; no out-of-scope modifications were introduced.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[eschabell]

@patrick-stephens and @cosmo0920 ready for review!