A globally accessed ASP.NET Core web app requires a URL ping test every five minutes and an alert when the app is unavailable from specific Azure regions. The solution should minimize development time. What should you implement?

Azure Application Insights availability tests are designed for this exact scenario. They allow you to create URL ping tests from various Azure regions, specify the test frequency (like every five minutes), and configure alerts when the application is unavailable. This is a built-in feature of Application Insights, minimizing development time compared to custom solutions. An Azure Monitor Availability metric and alert would monitor metrics like CPU usage or network in/out, but not directly perform a URL ping test from specific regions to check application availability. Writing an Azure Function would involve custom development, increasing development time, and requiring you to manage the function's deployment and execution across regions. An Azure Service Health alert monitors the health of Azure services themselves, not the availability of your specific application.