docs: pipeline: inputs: forward: document empty tag fallback and payload validation

[eschabell]

• Document that an empty incoming tag falls back to the input name when
  tag isn't set
• Document validation of PackedForward and CompressedPackedForward payloads
• Document the invalid PackedForward entry warning

Signed-off-by: Eric D. Schabell eric@schabell.org

Summary by CodeRabbit

• Documentation
  • Clarified that in v5.1.3 and later, the input name is used when the incoming tag is empty and neither tag nor tag_prefix is set; when tag_prefix is set, it is applied to the incoming tag.
  • Documented that v5.1.3 and later validates PackedForward and CompressedPackedForward payloads before ingestion, logs invalid PackedForward entry for an invalid log event, and rejects the payload.

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• pipeline/inputs/forward.md

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📝 Walkthrough

Walkthrough

The Forward input documentation describes tag fallback and packed-payload validation behavior in v5.1.3 and later.

Changes

Forward input documentation

Layer / File(s)	Summary
Document Forward input behavior pipeline/inputs/forward.md	The tag documentation describes using the input name when the incoming tag is empty and neither tag nor tag_prefix is set. A new section documents validation and rejection of PackedForward and CompressedPackedForward payloads with an invalid log event.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: cosmo0920

Merge Risk: ⚪ Minimal · up to 46a32

The tag wording matches v5.1.3. The payload-validation wording remains unverified against exact-version source, but no contradiction is established; no verified merge-blocking issue remains.

🚥 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 documentation changes for empty tag fallback and payload validation in the forward pipeline input.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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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[eschabell]

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Inline comments:
Review comments at @pipeline/inputs/forward.md:
- Line 23: Update the `tag` option description to clarify that an empty incoming
tag falls back to the input name only when `tag_prefix` is unset; when
`tag_prefix` is set, it is applied to the incoming tag first.

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• pipeline/inputs/forward.md

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[eschabell]

@patrick-stephens ready for review!

[eschabell]

@patrick-stephens ready to review!