Merge pull request #2541 from udit-001/docs/chatlitellm-langfuse

docs(langfuse): add chatlitellm section

docs/my-website/docs/langchain/langchain.md

@@ -133,3 +133,6 @@ chat(messages)
 ```
 </TabItem>
 </Tabs>
+
+## Use LangChain ChatLiteLLM + Langfuse
+Checkout this section [here](../observability/langfuse_integration#use-langchain-chatlitellm--langfuse) for more details on how to integrate Langfuse with ChatLiteLLM.

docs/my-website/docs/observability/langfuse_integration.md

@@ -132,6 +132,41 @@ print(response)
 
 ```
 
+### Use LangChain ChatLiteLLM + Langfuse
+Pass `trace_user_id`, `session_id` in model_kwargs
+```python
+import os
+from langchain.chat_models import ChatLiteLLM
+from langchain.schema import HumanMessage
+import litellm
+
+# from https://cloud.langfuse.com/
+os.environ["LANGFUSE_PUBLIC_KEY"] = ""
+os.environ["LANGFUSE_SECRET_KEY"] = ""
+
+os.environ['OPENAI_API_KEY']=""
+
+# set langfuse as a callback, litellm will send the data to langfuse
+litellm.success_callback = ["langfuse"] 
+
+chat = ChatLiteLLM(
+  model="gpt-3.5-turbo"
+  model_kwargs={
+      "metadata": {
+        "trace_user_id": "user-id2", # set langfuse Trace User ID
+        "session_id": "session-1" ,  # set langfuse Session ID
+        "tags": ["tag1", "tag2"] 
+      }
+    }
+  )
+messages = [
+    HumanMessage(
+        content="what model are you"
+    )
+]
+chat(messages)
+```
+
 
 ## Troubleshooting & Errors
 ### Data not getting logged to Langfuse ? 
@@ -142,4 +177,4 @@ print(response)
 - [Schedule Demo 👋](https://calendly.com/d/4mp-gd3-k5k/berriai-1-1-onboarding-litellm-hosted-version)
 - [Community Discord 💭](https://discord.gg/wuPM9dRgDw)
 - Our numbers 📞 +1 (770) 8783-106 / ‭+1 (412) 618-6238‬
-- Our emails ✉️ ishaan@berri.ai / krrish@berri.ai
+- Our emails ✉️ ishaan@berri.ai / krrish@berri.ai