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  https://aws.amazon.com/quickstart/architecture/eks-grafana/#   -Diagram https://aws-quickstart.github.io/quickstart-eks-grafana/ - Deployment guide

  Country class, this class is made immutable list of states as one of the member variable First general incorrect way is explained and correct way explained at the end. https://java2blog.com/how-to-create-immutable-class-in-java/