Integrate on Google Cloud Functions Node.js

npm install --save @opentelemetry/sdk-trace-node @opentelemetry/semantic-conventions

const { Resource } = require('@opentelemetry/resources');
const { NodeTracerProvider } = require('@opentelemetry/sdk-trace-node');
const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');
const { DtSpanExporter, DtSpanProcessor, DtTextMapPropagator, DtSampler } = require('@dynatrace/opentelemetry-core');

const processor = new DtSpanProcessor(new DtSpanExporter());
const provider = new NodeTracerProvider({
  resource: new Resource({
   "my.resource.attribute": "My Resource",
  }),
  sampler: new DtSampler(),
  // for @opentelemetry/sdk-trace-node versions lower than 1.29.0 use `provider.addSpanProcessor(processor)` instead
  spanProcessors: [processor]
  // ...other configurations
});

provider.register({
  propagator: new DtTextMapPropagator(),
  // ...other configurations
});

npm install --save @opentelemetry/sdk-node @opentelemetry/semantic-conventions

const { Resource } = require('@opentelemetry/resources');
const { NodeSDK } = require('@opentelemetry/sdk-node');
const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');
const { DtSpanExporter, DtSpanProcessor, DtTextMapPropagator, DtSampler } = require('@dynatrace/opentelemetry-core');

const sdk = new NodeSDK({
  resource: new Resource({
   "my.resource.attribute": "My Resource"
  }),
  sampler: new DtSampler(),
  spanProcessor: new DtSpanProcessor(new DtSpanExporter()),
  textMapPropagator: new DtTextMapPropagator(),
  // ...other configurations
});

sdk.start().then(() => {
  // Resources have been detected and SDK is started
});

const { startActiveHttpSpan, endHttpSpanAndFlush } = require('@dynatrace/opentelemetry-gcf');

// ...tracing initialization code

async function handler(req, res) {
  await startActiveHttpSpan(req, async (span) => {
    let error;
    try {
      // do something
    } catch (e) {
      error = e;
    }

    // status should be set before span ends
    res.status(error != null ? 500 : 200);
    /**
     * Span must be ended and flushed before handler sends response.
     * This limitiation comes from GCF, for details see:
     * https://cloud.google.com/functions/docs/concepts/nodejs-runtime#signal-termination
     */
    await endHttpSpanAndFlush(span, res, error);
    res.send("hello world");
  });
}

const { context, trace, ROOT_CONTEXT } = require('@opentelemetry/api');
const { startHttpSpan, endHttpSpanAndFlush } = require('@dynatrace/opentelemetry-gcf');

// ...tracing initialization code

async function handler(req, res) {
  const span = await startHttpSpan(req);

  let error;
  await context.with(trace.setSpan(ROOT_CONTEXT, span), async () => {
    try {
      // do something
    } catch (e) {
      error = e;
    }
  });

  // status should be set before span ends
  res.status(error != null ? 500 : 200);
  /**
   * Span must be ended and flushed before handler sends response.
   * This limitiation comes from GCF, for details see:
   * https://cloud.google.com/functions/docs/concepts/nodejs-runtime#signal-termination
   */
  await endHttpSpanAndFlush(span, res, error);
  res.send("hello world");
}