v4.0.4

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

Bug Fixes

• LLM Observability: Resolves an issue in activate_distributed_headers() where distributed requests missing a LLM Observability trace ID would be incorrectly propagated twice.

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• profiling: Fixes a bug where code that sub-classes our wrapped locks crashes with TypeError during profiling. One example of this is neo4j's AsyncRLock, which inherits from asyncio.Lock: https://github.com/neo4j/neo4j-python-driver/blob/6.x/src/neo4j/_async_compat/concurrency.py#L45

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• profiling: This fix resolves a race condition leading to incorrect stacks being reported for asyncio parent/child Tasks (e.g. when using asyncio.gather).