fastify.ts

  const fastifyOtelInstrumentation = new FastifyOtelInstrumentation({
    servername: pkg.name,
  });

  const fastifyAdapter = new FastifyAdapter();
  await fastifyAdapter
    .getInstance()
    .register(fastifyOtelInstrumentation.plugin());

  const app = await NestFactory.create<NestFastifyApplication>(AppModule, fastifyAdapter);