Next.js Tracing

Next.js requires additional configuration to enable OpenTelemetry tracing.

Step 1: Next.js Configuration

Start by enabling the instrumentation hook in your Next.js config:

next.config.ts

import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  experimental: {
    instrumentationHook: true, // Not required in Next.js 15+
  },
};

export default nextConfig;

Step 2: Mastra Configuration

Configure your Mastra instance:

mastra.config.ts

import { Mastra } from "@mastra/core";

export const mastra = new Mastra({
  // ... other config
  telemetry: {
    serviceName: "your-project-name",
    enabled: true,
  },
});

Step 3: Configure your providers

If you're using Next.js, you have two options for setting up OpenTelemetry instrumentation:

Option 1: Using a Custom Exporter

The default that will work across providers is to configure a custom exporter:

1. Install the required dependencies (example using Langfuse):

npm install @opentelemetry/api langfuse-vercel

2. Create an instrumentation file:

instrumentation.ts

import {
  NodeSDK,
  ATTR_SERVICE_NAME,
  resourceFromAttributes,
} from "@mastra/core/telemetry/otel-vendor";
import { LangfuseExporter } from "langfuse-vercel";

export function register() {
  const exporter = new LangfuseExporter({
    // ... Langfuse config
  });

  const sdk = new NodeSDK({
    resource: resourceFromAttributes({
      [ATTR_SERVICE_NAME]: "ai",
    }),
    traceExporter: exporter,
  });

  sdk.start();
}

Option 2: Using Vercel's Otel Setup

If you're deploying to Vercel, you can use their OpenTelemetry setup:

1. Install the required dependencies:

npm install @opentelemetry/api @vercel/otel

2. Create an instrumentation file at the root of your project (or in the src folder if using one):

instrumentation.ts

import { registerOTel } from "@vercel/otel";

export function register() {
  registerOTel({ serviceName: "your-project-name" });
}

Summary

This setup will enable OpenTelemetry tracing for your Next.js application and Mastra operations.

For more details, see the documentation for:

• Next.js Instrumentation
• Vercel OpenTelemetry