feat: Added Missing Attributes For Arize & Phoenix Integration (#10043)

[ishaan-jaff]

Title

This is a contributor PR

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I've added the missing attributes for Arize & Phoenix integration.

Relevant issues

None

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on (make test-unit)[https://docs.litellm.ai/docs/extras/contributing_code]
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature
🧹 Refactoring
✅ Test

Changes

• I've added the missing OpenInference span attributes to improve visibility with Arize & Phoenix dashboards.
• I've added detailed LLM request/response metadata capture, including model provider, tools, function parameters, exceptions, along with other LLM attributes.
• I've added helper functions, such as cast_as_primitive_value_type() to ensure OTEL compliance, and safe_set_attribute() to avoid tracing runtime errors.
• I've updated a unit test test_arize_set_attributes() for verifying all span attributes are correctly set.
• I've added inline comments across sections for better code readability and maintenance.
• I've validated integration with both Arize and Phoenix, confirming full trace visibility and attribute ingestion.

Integration Tests

Arize Traces

Phoenix Traces

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 23, 2025 1:27am

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