[Feature]: Log region to Langfuse

[Manouchehri]

The Feature

For things like Vertex AI, it'd be useful if we logged the region that was used.

Motivation, pitch

For troubleshooting/checking perf of regions.

Twitter / LinkedIn details

https://www.linkedin.com/in/davidmanouchehri/

[krrishdholakia]

makes sense - would this be in the metadata? @Manouchehri

[Manouchehri]

I think so. I was debating between metadata and model parameters, but metadata sounds more "correct" to me (since in theory the same model in a different region should always behave the same).

[Manouchehri]

I'm working on this, PR incoming soon.

[krrishdholakia]

Thanks!