Distributed Tracing with OpenTelemetry: A Practical Guide for Go Services

You have logs. You have metrics. A request enters your system through the API gateway, hops across five services, and fails somewhere deep in the order processing pipeline. You open Kibana, grep through thousands of log lines, and spend forty minutes correlating timestamps by hand. Distributed tracing eliminates that pain. It gives you a single, end-to-end view of a request as it flows through every service in your architecture. And with OpenTelemetry becoming the industry standard, there has never been a better time to wire it in. This article walks through instrumenting Go services with OpenTelemetry from scratch. No toy examples — everything here is production-grade code you can drop into a real system. Why Distributed Tracing Matters In a monolith, a stack trace tells you everything. In a distributed system, a single user action might touch an API gateway, an auth service, an order service, a payment provider, a notification queue, and a database. When something goes wrong — or jus