pipeline: podman metrics: document container disk I/O metrics

[stondo]

Summary

Documents the four new per-container block I/O metrics exposed by the
in_podman_metrics (Podman metrics) input plugin.

Companion to the code change in fluent/fluent-bit#11986.

Change

Adds container_disk_read_bytes_total, container_disk_write_bytes_total,
container_disk_reads_total and container_disk_writes_total to the example
output in pipeline/inputs/podman-metrics.md.

Signed-off-by: Stefano Tondo stondo@gmail.com

Summary by CodeRabbit

• Documentation
  • Added documentation with Prometheus-style metric examples for container disk I/O monitoring, including read/write bytes and operation counts.

[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: 665ba633-255c-4f5a-8a3e-ba581c753b07

📥 Commits

Reviewing files that changed from the base of the PR and between b68365f and 699ae87.

📒 Files selected for processing (1)

• pipeline/inputs/podman-metrics.md

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📝 Walkthrough

Walkthrough

The podman-metrics input documentation is extended with four new Prometheus-style disk block I/O counter examples: container_disk_read_bytes_total, container_disk_write_bytes_total, container_disk_reads_total, and container_disk_writes_total, each with # HELP, # TYPE, and a sample metric line.

Changes

Podman Metrics Disk I/O Documentation

Layer / File(s)	Summary
Disk I/O counter metric examples pipeline/inputs/podman-metrics.md	Adds # HELP, # TYPE, and sample value lines for four container disk I/O counters (read/write bytes, reads/writes completed) to the existing metrics example block.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A rabbit hops through bytes and blocks,
Counting reads and writes on docks,
Disk I/O now proudly shown,
Four new metrics fully grown!
🐇📊 Hop hop, the docs are sown!

🚥 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 change: adding documentation for container disk I/O metrics in the podman metrics documentation file.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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