Isolation requirements for microservice deployment

In 2012, Adam Wiggins, cofounder of the Heroku platform, presented 12 basic principles. These principles talk about defining new modern web applications from idea to deployment. This set of principles is now known as 12 factor App. These principles paved the way for new architectural styles, which evolved into microservice architectures. One of the principles of 12 factor app was as follows:

"Execute the app as one or more stateless processes" 
- Adam Wiggins (https://12factor.net/)

This means microservices are shared nothing architectures. So, services will be essentially stateless (except the database, which acts as the state store). The shared nothing principle is also applied across the entire spectrum of patterns and practices. This is nothing but isolation of components to achieve scale and agility.

In the microservice...