Use Application Insights to diagnose performance and errors in your web apps. Azure App Service is a great place to get started hosting and maintaining your web apps. You don’t have to enable App Insights upfront; the option is always there to be turned on when and as needed without re-deployment.
There are 3 options to get ASP.NET Core 2.1 Preview applications running on Azure App Service:
1. Installing the Preview1 site extension
2. Deploying your app self-contained
3. Using Web Apps for Containers
Installing the site extension
Starting with 2.1-preview1 we are producing an Azure App Service site extension that contains everything you need to build and run your ASP.NET Core 2.1-preview1 app.