This article shows you how to plan an implementation of the Reliable Web App pattern. The Reliable Web App pattern is a set of principles and implementation techniques that define how you should modify web apps (replatform) when migrating to the cloud. It focuses on the minimal code updates you need to make to be successful in the cloud.
https://learn.microsoft.com/en-us/azure/architecture/web-apps/guides/reliable-web-app/java/plan-implementation