Correlation IDs in ASP.NET Core: A Practical Guide for Backend Engineers

Correlation IDs are unique identifiers attached to requests that allow backend engineers to trace a request across multiple services in a microservices architecture. This guide explains how to implement them in ASP.NET Core, including adding them to logs, returning them to clients, and propagating them to downstream APIs. Using a shared correlation ID simplifies debugging by enabling searches across distributed logs with a single identifier.