A multi-tier application has its front end hosted in Azure App Service. Which service should you use to determine the average page load times for the application?

Azure Application Insights is the correct choice because it's an Application Performance Management (APM) service specifically designed to monitor live web applications. It automatically collects telemetry data, including page load times, request rates, and response times, providing deep insights into application performance and usage. The App Service activity log records control plane operations (e.g., creating or deleting an app), not application performance metrics. App Service diagnostic logs provide detailed information about application runtime behavior (e.g., HTTP logs, deployment logs), but they don't aggregate or analyze page load times in the same comprehensive way as Application Insights. Azure Advisor provides personalized recommendations for optimizing Azure resources, not real-time application performance monitoring.