Azure Functions is an event-driven serverless compute service built on Azure App Service that allows developers to deploy code without managing infrastructure. To ensure optimal performance of functions, Datadog has released an extension for Azure App Service which collects traces and correlates telemetry from resources running in Azure App Service, including support for Azure Functions. This extension provides function-level visibility into application performance, allowing users to identify bottlenecks and troubleshoot issues. With Datadog APM, users can get an end-to-end view of request traces across their infrastructure, automatically tagging traces by function name. Additionally, the extension enables correlationating Azure Functions trace data with metrics, logs, and other traces from across Azure-hosted resources for deeper visibility into the health and performance of App Service plans.