How can Application Insights be used to trace a request across multiple Azure services in a distributed application?

In a distributed Azure application, a single user request may travel through APIs, Azure Functions, databases, messaging services, and other dependencies. This discussion explores how Application Insights, distributed tracing, correlation, telemetry, dependencies, and operation IDs can be used to follow that request across service boundaries. Learn how developers can identify latency, failed dependencies, bottlenecks, and exceptions instead of troubleshooting each service in isolation. This is an essential observability skill for professionals building production-grade cloud and microservices solutions.