fix(anthropic): skip NotGiven/Omit sentinel in set_span_attribute

[nskun]

• I have added tests that cover my changes.
• If adding a new instrumentation or changing an existing one, I've added screenshots from some observability platform showing the change.
• PR name follows conventional commits format: feat(instrumentation): ... or fix(instrumentation): ....
• (If applicable) I have updated the documentation accordingly.(Not applicable)

Summary

Skip Anthropic SDK Omit and NotGiven sentinel values in set_span_attribute.

This prevents unset optional parameters such as temperature and top_p from being passed to OpenTelemetry as invalid span attribute types.

Testing

Added regression coverage for both anthropic.NOT_GIVEN and anthropic.Omit().

Fixes #4431

Summary by CodeRabbit

• Bug Fixes
  • Improved Anthropic instrumentation to ignore unspecified option values when recording telemetry.
  • Prevented internal sentinel values from appearing as span attributes.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 3841cc90-7e41-4a39-9048-3272ec90061d

📥 Commits

Reviewing files that changed from the base of the PR and between 62e24c2 and e2be0db.

📒 Files selected for processing (2)

• packages/opentelemetry-instrumentation-anthropic/opentelemetry/instrumentation/anthropic/utils.py
• packages/opentelemetry-instrumentation-anthropic/tests/test_set_span_attribute.py

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

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📝 Walkthrough

Walkthrough

The Anthropic instrumentation now skips Omit and NotGiven sentinel values before setting span attributes. Parameterized tests verify that both sentinel values do not call set_attribute.

Changes

Anthropic sentinel filtering

Layer / File(s)	Summary
Filter sentinel values and validate behavior packages/opentelemetry-instrumentation-anthropic/opentelemetry/instrumentation/anthropic/utils.py, packages/opentelemetry-instrumentation-anthropic/tests/test_set_span_attribute.py	set_span_attribute skips Omit and NotGiven values. Tests verify that neither sentinel calls set_attribute.

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

Merge Risk: ⚪ Minimal · up to e2be0

This localized change skips unset Anthropic sentinel values from span attributes and adds regression coverage; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 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 primary change: skipping Anthropic NotGiven and Omit sentinels.
Linked Issues check	✅ Passed	The implementation and regression tests satisfy issue #4431 by skipping both NOT_GIVEN and Omit sentinel values.
Out of Scope Changes check	✅ Passed	The changes are limited to sentinel filtering and focused regression tests for the linked issue.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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