* The new ReplicaSet API (Beta) in the Extensions API group is similar to
ReplicationController, but its [selector](http://kubernetes.io/docs/user-guide/labels/#label-selectors) is more general (supports set-based selector; whereas ReplicationController
only supports equality-based selector).
  * Scale subresource support is now expanded to ReplicaSets along with
ReplicationControllers and Deployments. Scale now supports two different types

  // Defaults to 1.
  // More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/#what-is-a-replicationcontroller
  // +optional
  optional int32 replicas = 1;

  // Minimum number of seconds for which a newly created pod should be ready
  // without any of its container crashing, for it to be considered available.

  // Defaults to 1.
  // More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/#what-is-a-replicationcontroller
  // +optional
  optional int32 replicas = 1;

  // Minimum number of seconds for which a newly created pod should be ready
  // without any of its container crashing, for it to be considered available.

  // Defaults to 1.
  // More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/#what-is-a-replicationcontroller
  // +optional
  optional int32 replicas = 1;

  // Minimum number of seconds for which a newly created pod should be ready
  // without any of its container crashing, for it to be considered available.