This tutorial provides a comprehensive guide on auto-instrumenting a Node.js application using OpenTelemetry, featuring a practical example with two locally hosted services based on the Express framework. The process involves installing necessary OpenTelemetry packages, adding a tracer to the application, and setting up an OpenTelemetry Collector to collect and export trace data to a chosen distributed tracing analytics tool. The tutorial demonstrates how to run the instrumented application and verify the trace data in the Jaeger UI, illustrating how OpenTelemetry simplifies automatic instrumentation without requiring changes to the application code itself. Additionally, it explains the configuration of an OpenTelemetry Collector using a YAML file for trace exportation and highlights the use of Logz.io as a potential backend for distributed tracing, with an invitation to explore further resources and try out the integration with a free trial.