docs: processors: content-modifier: add otel_log_attributes context

[eschabell]

Add the missing otel_log_attributes context to the OpenTelemetry
contexts table. Unlike the resource and scope contexts, this one
operates per log record rather than on shared group data. Update
the section intro text to reflect that distinction accurately.

Fixes #2482

Summary by CodeRabbit

• Documentation
  • Updated content modifier processor documentation to clarify scope semantics for OpenTelemetry log-related contexts. Refined per-context descriptions to specify whether operations apply to individual records or shared data across record groups, including newly documented otel_log_attributes context.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0efb3595-f99b-4d26-96df-c1ecb1bd8d51

📥 Commits

Reviewing files that changed from the base of the PR and between f41353c and beeab48.

📒 Files selected for processing (1)

• pipeline/processors/content-modifier.md

📝 Walkthrough

Walkthrough

This change updates documentation for the content modifier processor to clarify OpenTelemetry context scope semantics. It refines descriptions to distinguish between contexts operating on shared data across groups of records versus those operating per-record, and adds documentation for the otel_log_attributes context.

Changes

Cohort / File(s)	Summary
OpenTelemetry Context Documentation pipeline/processors/content-modifier.md	Refined scope semantics descriptions for OpenTelemetry log contexts, replaced blanket statement with per-context clarity, and added documentation for otel_log_attributes (per-record scope) alongside existing contexts (shared data scope).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Added documentation of the Routing Metrics & Observability features in fluent bit 4.2 to router docs. Fixes #2205. #2206 — Updates documentation for OpenTelemetry context types and related attribute handling in processors.

Suggested reviewers

• cosmo0920
• patrick-stephens

Poem

🐰✨ A hop through docs so neat,
Where otel_log_attributes now greet,
Per-record whispers, shared data too,
Clarity blooms—our scope shines through! 🌟

🚥 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 the otel_log_attributes context to the content-modifier processor documentation.
Linked Issues check	✅ Passed	The PR fulfills all coding requirements from issue #2482: adds otel_log_attributes to the documentation table with correct scope (Logs) and description (log-level attributes).
Out of Scope Changes check	✅ Passed	All changes are directly related to the issue objectives; the documentation updates to clarify per-record vs shared data semantics are necessary supporting changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[eschabell]

@coderabbitai review

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[eschabell]

@patrick-stephens and @cosmo0920 ready for review!