v4.6.3

Estimated end-of-life date, accurate to within three months: 05-2027 See the support level definitions for more information.

Bug Fixes

• LLM Observability: Fixes an issue where the payload size limit and event size limit were hardcoded and could not be configured. These are now configurable via the DD_LLMOBS_PAYLOAD_SIZE_BYTES and DD_LLMOBS_EVENT_SIZE_BYTES environment variables respectively. These default to 5242880 (5 MiB) and 5000000 (5 MB), matching the previous hardcoded values.

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• LLM Observability: Fixes an issue where the @llm decorator did not automatically annotate the return value as output in traces. The decorator now captures the return value and annotates it as output, consistent with @workflow and @task decorators. Manual annotations via LLMObs.annotate() still take precedence.

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• LLM Observability: Fixes an issue where Pydantic model outputs nested inside lists, tuples, or dicts were serialized as unreadable repr() strings instead of JSON. Pydantic v1 and v2 models are now properly serialized using model_dump() or .dict() respectively.