Send Otel Node traces to Axiom

node.js

const opentelemetry = require('@opentelemetry/sdk-node');
const { getNodeAutoInstrumentations } = require('@opentelemetry/auto-instrumentations-node');
const { OTLPTraceExporter } = require('@opentelemetry/exporter-trace-otlp-proto');
const { BatchSpanProcessor } = require('@opentelemetry/sdk-trace-base');
const { Resource } = require('@opentelemetry/resources');
const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');

// Initialize OTLP trace exporter
const traceExporter = new OTLPTraceExporter({
  url: 'https://api.axiom.co/v1/traces',
  headers: {
    'Authorization': 'Bearer $API_TOKEN',
    'X-Axiom-Dataset': '$DATASET'
  },
});

const resource = new Resource({
  [SemanticResourceAttributes.SERVICE_NAME]: 'node traces', 
});

const sdk = new opentelemetry.NodeSDK({
  spanProcessor: new BatchSpanProcessor(traceExporter),
  resource: resource, // Add the resource here
  instrumentations: [getNodeAutoInstrumentations()],
});

sdk.start();

Thanks for sharing. Is it needed for me to specify a value for traceExporter or is it enough to just use the spanProcessor?

For example, line 21 would become

const sdk = new opentelemetry.NodeSDK({
  spanProcessor: new BatchSpanProcessor(traceExporter),
  traceExporter: traceExporter,
  resource: resource, // Add the resource here
  instrumentations: [getNodeAutoInstrumentations()],
});

Also, if I use your code in TypeScript and build it, I get the error

../../node_modules/.pnpm/@[email protected]_@[email protected]/node_modules/@opentelemetry/otlp-exporter-base/build/src/platform/browser/util.d.ts:10:84 - error TS2304: Cannot find name 'BlobPropertyBag'.

any idea for a fix?

Thanks @pmbanugo is it working for you?

No, it's not needed to specify traceExporter separately in the NodeSDK configuration when you're already using it in the BatchSpanProcessor

Also, if I use your code in TypeScript and build it, I get the error

../../node_modules/.pnpm/@[email protected]_@[email protected]/node_modules/@opentelemetry/otlp-exporter-base/build/src/platform/browser/util.d.ts:10:84 - error TS2304: Cannot find name 'BlobPropertyBag'.

any idea for a fix?

which version of ts are you using? i think older versions might not have the recent definitions for the DOM. in your compiler options can you confirm in tsconfig.json:

{
  "compilerOptions": {
    "lib": ["dom", "es2015", ],
    
  }
}

My lib option is "lib": ["ES2023"],. I'm compiling for Node so I omit the DOM types.

Anyway, I got a hack to make it compile but it still doesn't export the logs. I'm guessing it's something with otel. Maybe you could check with your team for someone that's familiar with logging for OTel in JavaScript.

I could try to configure it with the pino or winston extension directly with Axiom. But I'd prefer auto-instrumentation if it;s possible

The config above is to send traces to Axiom using url: 'https://api.axiom.co/v1/traces You can use our supported SDKs to log into Axiom:

• js sdk: https://github.com/axiomhq/axiom-js
• pino: https://github.com/axiomhq/axiom-js/tree/main/packages/pino
• winston: https://github.com/axiomhq/axiom-js/tree/main/packages/winston

The js logs package for Otel is still under development and experimental: https://opentelemetry.io/docs/instrumentation/js/

Thanks. I got it working it working with the pino package.