Store OpenAI Responses streaming response in events format understood by UI

[alexmojaki]

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Pull Request Overview

This PR standardizes the OpenAI Responses API streaming response format to use an events structure that is understood by the UI, moving away from storing raw response data to a more consistent event-based format.

• Replaces raw response_data with structured events for OpenAI streaming responses
• Adds a new get_attributes method to StreamState for customizing logged attributes
• Updates test expectations to reflect the new event-based format

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
logfire/_internal/integrations/llm_providers/types.py	Adds get_attributes method to StreamState base class
logfire/_internal/integrations/llm_providers/openai.py	Implements event-based response format and custom attribute handling
logfire/_internal/integrations/llm_providers/llm_provider.py	Updates streaming response logging to use new attribute method
tests/otel_integrations/test_openai.py	Updates test expectations for new event-based format
tests/otel_integrations/test_anthropic.py	Reorders JSON schema properties (likely due to dictionary ordering changes)

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