Full Changelog: [v0.2.0-alpha.18...v0.2.0-alpha.19](https://github.com/openlayer-ai/openlayer-python/compare/v0.2.0-alpha.18...v0.2.0-alpha.19)
Features
* feat: allow specification of context column name when using tracers ([05c5df5](https://github.com/openlayer-ai/openlayer-python/commit/05c5df55a10eaed48b5d54c4b7fe4f5406b8ae39))
* feat: support Vertex AI models via LangChain callback handler ([0e53043](https://github.com/openlayer-ai/openlayer-python/commit/0e5304358869b400d54b9abe5bd0158dd5a94bf0))