Add config option documentation for new in_tail option 'ignore_unavailable'

[ner216]

Config documentation for the new 'ignore_unavailable' config option for the in_tail plugin.

Companion code: fluent/fluent-bit#12097

This option makes in_tail ignore paths that do not exist while scanning. When active, errors/warnings regarding missing files/paths will be omitted.

Summary by CodeRabbit

• Documentation
  • Documented the ignore_unavailable option for the Tail input plugin.
  • Clarified that it ignores missing/non-existent file paths encountered during scanning.
  • Noted the option defaults to disabled (false).

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 644e825 and 4b52d49.

📒 Files selected for processing (1)

• pipeline/inputs/tail.md

🚧 Files skipped from review as they are similar to previous changes (1)

• pipeline/inputs/tail.md

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📝 Walkthrough

Walkthrough

The Tail input plugin configuration table now documents the ignore_unavailable option, which skips nonexistent file paths during scanning and defaults to false.

Changes

Tail input documentation

Layer / File(s)	Summary
Document unavailable-path handling pipeline/inputs/tail.md	Adds the ignore_unavailable option with its scanning behavior and default value.

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

Possibly related PRs

• fluent/fluent-bit-docs#2222: Updates the same Tail input configuration table.

Suggested labels: 4.2

Suggested reviewers: eschabell

🚥 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 describes the documented new in_tail option added in this pull request.
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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[coderabbitai]

Actionable comments posted: 1

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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@pipeline/inputs/tail.md`:
- Line 34: Update the ignore_unavailable option description in tail.md to state
that enabling it ignores nonexistent file paths and suppresses the related
errors and warnings during scanning.

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Fix all unresolved CodeRabbit comments on this PR:

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0f48a2ef-b8cb-4b6b-8131-62653a270ed8

📥 Commits

Reviewing files that changed from the base of the PR and between a4dd9b5 and 1d60210.

📒 Files selected for processing (1)

• pipeline/inputs/tail.md

[eschabell]

@ner216 I fixed some issues on the wording, but now ready to go once the code PR merges.

[ner216]

@ner216 I fixed some issues on the wording, but now ready to go once the code PR merges.

Thank you, I really appreciate it