Azure Functions is an on-demand serverless compute offering built on top of Azure App Service that enables deployment of event-driven code without provisioning and managing infrastructure. To ensure applications respond quickly when invoked, it's essential to monitor performance and resource bottlenecks. The Datadog extension for Azure App Service collects traces and correlates telemetry from resources running in Azure App Service, providing function-level visibility into serverless Azure infrastructure. This allows users to identify performance issues, optimize their Azure-hosted applications, and troubleshoot problems efficiently by breaking down request traces into spans and automatically tagging them with function names. The Datadog extension also enables correlation with metrics and logs from across the Azure-hosted resources, helping users determine whether performance issues are related to underlying capacity problems or other factors. By integrating the Datadog App Service extension with Azure Functions, users can gain deeper visibility into their serverless infrastructure and take steps to reconfigure their functions and App Service plans for better performance.