[FEATURE] Langsmith integration

[propertius]

This is somewhat related to #246: What would be the appropriate way to integrate LangSmith when using this library?
Many thanks in advance!

[langchain4j]

Hey @propertius, #1058 will be finalized and released next week.
One could then implement a listener and hook it to the model. One of the implementations can be for LangSmith, others for OTel, etc.
I guess it will make sense to have an out-of-the-box implementation of LangSmith in langchain4j, are you interested to implement that?
There is an official java sdk: https://github.com/langchain-ai/langsmith-java

[propertius]

Hi @langchain4j, thanks for your promptly answer. I cannot commit to the implementation yet, as we are still evaluating our options within the company.

[langchain4j]

@propertius Sure! What options do you have in mind?

[propertius]

Hi @langchain4j: we're evaluating using the Open AI Assistants API + Tools directly. The cons are of course, we would make us vendor dependent. I like your stack a lot. Observability would be a major plus by your solution.

[langchain4j]

@propertius Ah, I see. I thought you were talking about observability options. Do you consider LangSmith only or other options as well?

[showpune]

Hi @langchain4j
I am interested that beside langchain smith, can we also integrated with opentelemetry for trace? What I think we need to enhance include

1. span process in new thread like in RetrievalAugmentor
2. Add some auto-instrument in opentelemetry

[langchain4j]

@showpune we are working towards supporting OTel, this is a first step: #1058