The idea of the decoupling large monolithic application into micro services provides us the capability to develop set of independent, reusable components. This will help to scale up/down as required and also we can modify each service based on different requirements instead of modifying one big application. However there are cases where we need two services to work together such as application server and logging service (or logging agent). In this case actually we do not need to build your application as one by merging two services as they cover different functions. We still can develop and build them separately and deploy together in one pod which will share the same life cycle.