1. The controller does not accept any dynamic user config through flags. All user interaction is through the
IstioOperator CR.
1. The controller has additional logic that mirrors istioctl commands like upgrade, but is driven from the declarative
API rather than command line.

### Quick tour of CLI commands

#### Flags

The `istioctl` command supports the following flags:

}

// IngressClass represents the class of the Ingress, referenced by the Ingress
// Spec. The `ingressclass.kubernetes.io/is-default-class` annotation can be
// used to indicate that an IngressClass should be considered default. When a
// single IngressClass resource has this annotation set to true, new Ingress
// resources without a class specified will be assigned this default class.
message IngressClass {

  // +listType=map
  // +listMapKey=name
  repeated CSIStorageCapacity items = 2;
}

// StorageClass describes the parameters for a class of storage for
// which PersistentVolumes can be dynamically provisioned.
//
// StorageClasses are non-namespaced; the name of the storage class
// according to etcd is in ObjectMeta.Name.
message StorageClass {
  // Standard object's metadata.

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