What's Changed
* Allow extra variables when invoking prompt templates by jacoblee93 in https://github.com/langchain-ai/langchain/pull/10765
* keep reference to old embeddings base by hwchase17 in https://github.com/langchain-ai/langchain/pull/10759
* fix broken link in docugami loader docs by tjaffri in https://github.com/langchain-ai/langchain/pull/10753
* Update ContextCallbackHandler Docstring & metadata key by BarberAlec in https://github.com/langchain-ai/langchain/pull/10732
* Update routing cookbook to include a RunnableBranch example by jacoblee93 in https://github.com/langchain-ai/langchain/pull/10754
* Merge metadata + tags in config by hinthornw in https://github.com/langchain-ai/langchain/pull/10762
* Sagemaker endpoint capability to inject boto3 client for cross account scenarios by vikramshitole in https://github.com/langchain-ai/langchain/pull/10728
* Update argilla.ipynb with spelling fix by ShorthillsAI in https://github.com/langchain-ai/langchain/pull/10611
* Bagatur/bump 295 by baskaryan in https://github.com/langchain-ai/langchain/pull/10785
New Contributors
* BarberAlec made their first contribution in https://github.com/langchain-ai/langchain/pull/10732
* vikramshitole made their first contribution in https://github.com/langchain-ai/langchain/pull/10728
**Full Changelog**: https://github.com/langchain-ai/langchain/compare/v0.0.294...v0.0.295