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Strangler Pattern
The concept of the strangler pattern is usually used when you do migrate the monolithic application to a microservice architect.

Many companies have trouble migrating their legacy (business) mission-critical applications. The issue is the terribly high difficulty and complexity of the migration, and in most cases, the companies can not afford to have x days downtime for their mission-critical applications. (Imagine if you need to stop your entire services in the banking & logistics industry)
However, many organizations are under high pressure because of such as the regulatory mandatory requirement, out of support of the legacy system, and heightened pressure to use modern technologies.
Strangler Application Pattern
https://docs.microsoft.com/en-us/azure/architecture/patterns/strangler-fig The cloud providers introduce the strangler application pattern to encourage their customers to decide to migrate their old infrastructure to the cloud environment.

Their solution commonly nudges the decision-makers to get their buy-in with the approach like the milestones above. In the begging, they move the part of applications (lower…