Configure OpenTelemetry SDK.

TODO: collapasable, copyable, download, etc

I'm using @opentelemetry/api and I can send my telemetry to http://deductive-otel-collector:4318/v1/metrics. How do I confugre it to do that?To configure your application using the @opentelemetry/api to send telemetry data (like metrics) to a specific endpoint, such as "http://deductive-otel-collector:4318/v1/metrics", you will typically use the OpenTelemetry SDK along with an appropriate exporter. The @opentelemetry/api itself provides the interfaces and classes needed to interact with the API, but the actual telemetry data exporting is handled by the SDK components.

Here’s a basic guide on how to set up the OpenTelemetry SDK for Node.js to export metrics to your specified endpoint:

Step 1: Install the necessary packages

First, you need to install the OpenTelemetry SDK and the necessary exporters. For exporting metrics, you might use the OTLP (OpenTelemetry Protocol) exporter.

npm install @opentelemetry/sdk-node @opentelemetry/exporter-metrics-otlp-http

Step 2: Configure the SDK and Exporter

You can set up a simple Node.js script to configure the OpenTelemetry SDK to collect metrics and use the OTLP HTTP exporter to send these metrics to your endpoint.

const { MeterProvider } = require('@opentelemetry/sdk-metrics-base');
const { OTLPTraceExporter } = require('@opentelemetry/exporter-trace-otlp-http');

// Configure the OTLP Metrics Exporter
const otlpExporter = new OTLPTraceExporter({
  url: 'http://deductive-otel-collector:4318/v1/metrics' // your collector endpoint
});

// Instantiate the Meter Provider with the OTLP Exporter
const meterProvider = new MeterProvider({
  exporter: otlpExporter,
  interval: 1000, // How often to push metrics (in ms)
});

// Register the Meter Provider globally
meterProvider.register();

// Creating a meter
const meter = meterProvider.getMeter('your-meter-name');

// Creating a counter metric
const counter = meter.createCounter('your-counter-name', {
  description: 'Counts something'
});

// Record some measurements
counter.add(1, { label: 'your-label' });

console.log('Metrics will be sent to the collector');

Step 3: Run your application

Run your Node.js application as usual. The configured SDK will collect metrics and send them to the specified OTLP endpoint.

node your-script.js

Notes:

• Make sure your network configurations and firewall settings allow your application to communicate with the endpoint.
• The example uses the latest versions available at the time of writing, so you may need to adjust imports and configurations if there are updates or breaking changes in future versions of the OpenTelemetry packages.
• Be sure to replace placeholders like 'your-meter-name', 'your-counter-name', and 'your-label' with values appropriate for your application context.

This setup should enable your application to send metrics to the specified OpenTelemetry collector endpoint effectively.This is a NextJs app, where would you stick it?Integrating OpenTelemetry to export metrics in a Next.js application involves configuring the OpenTelemetry SDK in the server-side part of your Next.js app. Next.js is a framework that supports both server-side rendering (SSR) and static site generation (SSG), so it’s important to initialize the OpenTelemetry instrumentation only in the server-side or API route parts of the application to avoid bundling it into the client-side code.

Here’s how you can set up OpenTelemetry in a Next.js application:

Step 1: Configure OpenTelemetry in a separate module

Create a separate module to configure and initialize the OpenTelemetry SDK. This ensures that the telemetry setup does not interfere with the client-side code and is only included during server-side execution.

1. Create a file for the OpenTelemetry setup (e.g., otel-config.js in the root directory).

// otel-config.js
const { MeterProvider } = require('@opentelemetry/sdk-metrics-base');
const { OTLPTraceExporter } = require('@opentelemetry/exporter-trace-otlp-http');

// Only configure OpenTelemetry if running on the server
if (typeof window === 'undefined') {
  const otlpExporter = new OTLPTraceExporter({
    url: 'http://deductive-otel-collector:4318/v1/metrics'
  });

  const meterProvider = new MeterProvider({
    exporter: otlpExporter,
    interval: 1000,
  });

  meterProvider.register();

  const meter = meterProvider.getMeter('nextjs-app-meter');

  const counter = meter.createCounter('page_visit', {
    description: 'Counts page visits'
  });

  module.exports = { counter };
} else {
  module.exports = { counter: null }; // No-op for client side
}

Step 2: Integrate telemetry into your API routes or server-side logic

Wherever you have server-side logic or API routes in your Next.js application, you can import and use the configured metrics.

For example, you might want to count visits to a specific API route:

// pages/api/visit.js
const { counter } = require('../../otel-config');

export default function handler(req, res) {
  if (counter) {
    counter.add(1);
  }
  res.status(200).json({ message: 'Page visited' });
}

Step 3: Start your Next.js application

Run your application as usual. If you set up everything correctly, the server-side part of your Next.js application will send metrics to the specified endpoint whenever the API route is hit.

npm run dev

Important Considerations:

• Server-side Only: Ensure that any OpenTelemetry-related code does not execute on the client side to avoid bundling it into client-side packages and potentially increasing the size of your JavaScript bundle.
• Performance: Consider the performance implications of metric collection, especially if you are collecting a large number of metrics or have high traffic. The OpenTelemetry SDK is designed to be efficient, but inappropriate use can still impact application performance.
• Security: Ensure that the telemetry data you collect does not contain sensitive information and that your endpoint is secured appropriately.

This setup will allow you to integrate OpenTelemetry with a Next.js application efficiently, focusing on server-side metric collection while keeping the client-side application clean from unnecessary telemetry code.

Configure OpenTelemetry SDK. created at Tue Jan 20 1970 20:19:27 GMT+0000 (Coordinated Universal Time)