tracing.js

const { JaegerExporter } = require('@opentelemetry/exporter-jaeger');
const { Resource } = require("@opentelemetry/resources");
const { SemanticResourceAttributes } = require("@opentelemetry/semantic-conventions");
const { ConsoleSpanExporter } = require('@opentelemetry/sdk-trace-base');
const { SimpleSpanProcessor } = require("@opentelemetry/sdk-trace-base");
const { NodeTracerProvider } = require("@opentelemetry/sdk-trace-node");
const { trace } = require("@opentelemetry/api");
//Instrumentations
const { ExpressInstrumentation } = require("opentelemetry-instrumentation-express");
const { MongoDBInstrumentation } = require("@opentelemetry/instrumentation-mongodb");
const { HttpInstrumentation } = require("@opentelemetry/instrumentation-http");
const { registerInstrumentations } = require("@opentelemetry/instrumentation");

// Exporting a function that sets up and returns a tracer
module.exports = function setupTracer(serviceName) {
    const options = {
        tags: [], // optional
        // You can use the default UDPSender
        host: 'localhost', // optional
        port: 6832, // optional
        // OR you can use the HTTPSender as follows
        // endpoint: 'http://localhost:14268/api/traces',
        maxPacketSize: 65000 // optional
    }
   const exporter = new JaegerExporter(options); // Make sure to provide options
   const provider = new NodeTracerProvider({
       resource: new Resource({
           [SemanticResourceAttributes.SERVICE_NAME]: serviceName,
       }),
   });
   provider.addSpanProcessor(new SimpleSpanProcessor(exporter));
   provider.register();
   registerInstrumentations({
       instrumentations: [
           new HttpInstrumentation(),
           new ExpressInstrumentation(),
           new MongoDBInstrumentation(),
       ],
       tracerProvider: provider,
   });
   return trace.getTracer(serviceName);
};