Availability Zone support for the public multi-tenant Azure App Service enables you to build high-availability into your application architecture. The App Service platform automatically allocates compute across zones ensuring applications stay up and running. Combined with Availability Zone support across Azure for storage, networking and data, you can create highly available end-to-end application architectures.
This capability is available in Premium v2 and Premium v3 App Service Plans.
(Availability Zone support for App Service Environments is already generally available).
Learn more.