You have a web app hosted in Azure. Which tool should you use to measure how long web pages take to load in a user's browser?

Application Insights, a feature of Azure Monitor, is specifically designed for monitoring web applications. It collects telemetry data, including client-side performance metrics like page load times, from web apps and services. This allows you to understand user experience and identify performance bottlenecks. Azure Monitor alerts are notifications triggered by metrics or logs, but they don't directly measure page load times; they react to data collected by other tools like Application Insights. Log Analytics is a service for querying and analyzing log data, but it's not the primary tool for collecting client-side performance metrics. Azure Network Watcher focuses on network performance and diagnostics, not application-level page load times.