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docs: pipeline: outputs: logdna: document hostname promotion - #2678

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@eschabell eschabell commented Aug 17, 2026

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Document the hostname primary field added to the LogDNA output plugin
in v5.1.1 (fluent-bit 84a610a63).

  • Add hostname to the list of promoted keys in the exclude_promoted_keys description, which was missing it
  • Add a hostname row to the data discovery and enrichment table covering the record key and the startup-resolved fallback
  • Explain that per-line promotion allows a different host per record, while the resolved hostname is still sent with the batch

Note updates for code changes without docs PR.

Summary by CodeRabbit

  • Documentation
    • Clarified LogDNA hostname handling when promoted keys are excluded from log lines.
    • Documented per-record hostname promotion and distinguished it from the startup-resolved hostname used for batch queries.

@eschabell eschabell self-assigned this Aug 17, 2026
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eschabell requested a review from a team as a code owner August 17, 2026 11:16
@eschabell eschabell added waiting-on-review Waiting on a review from mainteners 5.1.1 labels Aug 17, 2026
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📝 Walkthrough

Walkthrough

The LogDNA output documentation now describes hostname as a promoted key. It documents per-record hostname discovery, exclusion from the line body, and its distinction from the batch hostname query parameter.

Changes

LogDNA hostname promotion

Layer / File(s) Summary
Document hostname promotion behavior
pipeline/outputs/logdna.md
The documentation describes per-record hostname promotion, fallback behavior, exclusion from the line body, and updated payload examples.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 89f2c

This documentation update is localized and introduces no actionable merge-blocking risk; it is merge-ready after normal checks and review.

Suggested reviewers: patrick-stephens

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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 documentation change for hostname promotion in the LogDNA pipeline output.
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@eschabell

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Actionable comments posted: 1

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Inline comments:
In `@pipeline/outputs/logdna.md`:
- Line 17: Update the “Exclude promoted keys” documentation to include hostname
alongside the other promoted keys, and revise its example to show hostname being
removed instead of host. Keep the surrounding option behavior and examples
unchanged.
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Comment thread pipeline/outputs/logdna.md
  Document the hostname primary field added to the LogDNA output plugin
  in v5.1.1 (fluent-bit 84a610a63).

  - Add hostname to the list of promoted keys in the
    exclude_promoted_keys description, which was missing it
  - Add a hostname row to the data discovery and enrichment table
    covering the record key and the startup-resolved fallback
  - Explain that per-line promotion allows a different host per record,
    while the resolved hostname is still sent with the batch
  - The "Exclude promoted keys" section listed level, severity, app, file,
    and meta but omitted hostname, which the plugin promotes the same way.
    Add it to the list and to the summary of values sent as top-level
    fields.
  - Change the example record to use hostname instead of host. The old
    example was accurate, since host is not a promoted key, but it read as
    shorthand for hostname and invited the wrong conclusion. The log field
    now demonstrates that non-promoted fields remain in the line body.

  Note updates for code changes without docs PR.

Signed-off-by: Eric D. Schabell <eric@schabell.org>
@eschabell
eschabell force-pushed the erics_out_logdna_updates branch from a94bcb8 to 89f2c62 Compare August 17, 2026 16:59
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@patrick-stephens ready for review!

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