CallbackHandler not sending traces in LangGraph

[jigarzon]

I am testing the Langfuse integration for observability on a LangGraph. I have a runnable object after:

        workflow.addNode(...)
        workflow.addNode(...)
        workflow.addEdge(...)

        this.runnable = workflow.compile();

       const callbackHandler = new CallbackHandler(
            {
                userId
            })
        const finalState = await this.runnable.invoke(initialState, { configurable: { llm }, callbacks: [callbackHandler] });

In the service, I have the following initialization code also:

   .... //initialization of keys via config

   const sdk = new NodeSDK({
        spanProcessors: [new LangfuseSpanProcessor({
          publicKey, secretKey, baseUrl, environment
        })],
      });

      sdk.start();

The environment is set up because I can retrieve prompts, but after following the documentation, I'm still unable to see traces for the invocations of my graph.

Relevant packages & versions:

    "@opentelemetry/sdk-node": "^0.207.0",
    "@langfuse/client": "^4.3.0",
    "@langfuse/core": "^4.3.0",
    "@langfuse/langchain": "^4.3.0",
    "@langfuse/otel": "^4.3.0",

    "langchain": "^0.3.19",
    "@langchain/community": "^0.3.35",
    "@langchain/core": "^0.3.42",
    "@langchain/google-genai": "^0.2.0",
    "@langchain/langgraph": "^0.2.55",
    "@langchain/openai": "^0.4.4",

[hassiebp]

Thanks for raising this! Could you please share how you have set up OpenTelemetry?