When you design a web application that's based on a microservices architecture, you decide how to split your application's features into microservices, and how those microservices are called as part of the application. For long-running services, you might want to use asynchronous service calls. This reference architecture discusses how to deploy a containerized application that invokes long-running processes asynchronously.
https://cloud.google.com/architecture/image-processing-using-microservices-and-asynchronous-messaging
