The strangler design pattern is a popular design pattern to incrementally transform your monolithic application to microservices by replacing old functionality with a new service. Once the new component is ready, the old component is strangled and a new one is put to use.

The facade interface, which serves as the primary interface between the legacy system and the other apps and systems that call it, is one of the most important components of the strangler pattern.

External apps and systems will be able to identify the code associated with a certain function, while the underlying historical system code will be obscured by the facade interface. The strangler design addresses this by requiring developers to provide a façade interface that allows them to expose individual services and functions when they break them free from the monolith.

You need to understand the quality and reliability of your system, whether you're working with legacy code, starting the process of "strangling" your old system, or running a newly containerized application. When anything goes wrong, you need to know how the system got there and why it went down that road.

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