[docs-patrol] Document BEATS_OTEL_TRACES_DISABLE in Filebeat CEL tracing docs

[github-actions]

Recent code changes introduced documentation drift.

Changes Requiring Documentation Updates

1. CEL tracing disable override env var is implemented but not documented in reference docs

Commit(s):

• fb0542f (https://github.com/elastic/beats/commit/fb0542fabb73d5e0445295df5deb3da41f4a6467)

What changed:

• CEL tracing support was added.
• A non-standard override env var was added to disable tracing export per input: BEATS_OTEL_TRACES_DISABLE="cel".
• Code evidence:
  • x-pack/filebeat/input/cel/doc.go (lines ~146-149) documents this env var in package docs.
  • x-pack/filebeat/otel/trace.go (lines ~127-143) implements parsing of BEATS_OTEL_TRACES_DISABLE.

Documentation impact:

• docs/reference/filebeat/filebeat-input-cel.md currently says tracing is activated using OTel-standard env vars and does not mention BEATS_OTEL_TRACES_DISABLE.
• docs/reference/filebeat/ contains no mention of BEATS_OTEL_TRACES_DISABLE.
• This can mislead operators because the override is a public, user-actionable control that changes behavior.

Suggested Actions

• Update docs/reference/filebeat/filebeat-input-cel.md to document BEATS_OTEL_TRACES_DISABLE and accepted values (CSV input names such as cel, httpjson).
• Clarify precedence/interaction with OTEL_TRACES_EXPORTER and other OTel env vars.
• Add at least one short example showing disabling CEL trace export with the env var.

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• expires on Apr 6, 2026, 2:48 PM UTC

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