Issue: Can't get any traces using OTel with @ai/sdk + Sentry

[cacoos]

Hey!

I'm trying to setup OTel for tracing with Langsmith in NextJS, using the Vercel AI SDK and Sentry.

I followed the guide here: https://docs.smith.langchain.com/observability/how_to_guides/tracing/trace_whttps://github.com/langchain-ai/langsmith-sdk/issues/new/chooseith_vercel_ai_sdk#sentry but there are a couple of outdated stuff (so does Sentry docs..)

Specifically this snippet:

client?.traceProvider?.addSpanProcessor(
  new BatchSpanProcessor(new AISDKExporter())
);

client doesn't have traceProvider 🤔

I've set it up like this:

// This file configures the initialization of Sentry on the client.
// The config you add here will be used whenever a users loads a page in their browser.
// https://docs.sentry.io/platforms/javascript/guides/nextjs/

import * as Sentry from "@sentry/nextjs";
import { AISDKExporter } from "langsmith/vercel";

const client = Sentry.init({
  dsn: "[DSN]",

  // Skip OpenTelemetry setup
  skipOpenTelemetrySetup: true,

  // Define how likely traces are sampled
  tracesSampleRate: 1,

  // Setting this option to true will print useful information to the console while you're setting up Sentry.
  debug: false,
});

import {
  BasicTracerProvider,
  BatchSpanProcessor,
} from "@opentelemetry/sdk-trace-base";
import {
  SentryPropagator,
  SentrySampler,
  SentrySpanProcessor,
} from "@sentry/opentelemetry";

const provider = new BasicTracerProvider({
  sampler: new SentrySampler(client!),
  spanProcessors: [
    new SentrySpanProcessor(),
    new BatchSpanProcessor(new AISDKExporter()),
  ],
});

provider.register({
  propagator: new SentryPropagator(),
  contextManager: new Sentry.SentryContextManager(),
});

Buuut it doesn't work, Langsmith doesn't show anything. Any suggestions? Thank you!

[edit]

These are the logs after activating debug inside AISDKExporter:

Toggle logs

[ai.streamText] 7072b281-18d7-5f7f-a395-203f0e397cb4 {
  run_type: 'llm',
  name: 'anthropic.messages',
  inputs: { messages: [ [Object], [Object] ] },
  outputs: { llm_output: { type: 'ai', data: [Object], token_usage: [Object] } },
  events: [],
  extra: {
    batch_size: 1,
    metadata: {
      ls_provider: 'anthropic',
      ls_model_type: 'messages',
      ls_model_name: 'claude-3-5-sonnet-20240620',
      'ai.operationId': 'ai.streamText'
    }
  },
  session_name: 'development',
  start_time: 1737672793834,
  end_time: 1737672796511
}
[ai.streamText.doStream] ba66cb0e-198d-5880-92a4-8b6677870f84 {
  run_type: 'llm',
  name: 'anthropic.messages',
  inputs: { messages: [ [Object], [Object] ] },
  outputs: { llm_output: { type: 'ai', data: [Object], token_usage: [Object] } },
  events: [ { name: 'new_token', time: 1737672794826 } ],
  extra: {
    batch_size: 1,
    metadata: {
      ls_provider: 'anthropic',
      ls_model_type: 'messages',
      ls_model_name: 'claude-3-5-sonnet-20240620',
      'ai.operationId': 'ai.streamText.doStream'
    }
  },
  session_name: 'development',
  start_time: 1737672793836,
  end_time: 1737672796509
}
[POST] 623ff1fc-31b9-53c3-a49e-6ad4d9f093dc undefined
[start response] c6b3e1df-861d-5da8-a8a0-409ee882e047 undefined
[POST /api/trpc/websites.createWebsiteVersion?batch=1] 50543616-472f-5c59-a4e9-10e629207eb6 undefined
[POST] b19317a0-cc03-58ea-8ced-d8733150a515 undefined
[POST /api/trpc/[trpc]/route] fd93e411-1a12-5736-885a-f50a07cd6e10 undefined
[resolve page components] ca2ec062-a1d4-546c-bbd8-df0d3080a4bd undefined
[executing api route (app) /api/trpc/[trpc]/route] 9e6e30e8-a032-52bc-9a7f-a3da02f7575c undefined
[start response] cd11396e-2a9d-53d4-8cbd-7ca13cd5984b undefined
[GET /api/trpc/websites.getWebsite?batch=1&input=%7B%220%22%3A%7B%22json%22%3A%7B%22websiteSlug%22%3A%22da%22%7D%7D%7D] 04d2321a-7cc2-5339-b98d-e6291adc9e23 undefined
[resolve page components] e4c65e1a-d6a4-5d1f-b90b-ac5742a3c357 undefined
[executing api route (app) /api/trpc/[trpc]/route] f074bb9b-5a1a-5eab-80c6-5eeab0af1976 undefined
[start response] 9397ae37-1097-5dc7-948d-d07589dd8f4a undefined
[2025-01-23T22:53:17.069Z] [LangSmith] sampled runs to be sent to LangSmith []