code: func ValidateReplicationControllerStatusUpdate(controller, oldController *core.ReplicationController) field.ErrorList {
  	allErrs := ValidateObjectMetaUpdate(&controller.ObjectMeta, &oldController.ObjectMeta, field.NewPath("metadata"))
  	allErrs = append(allErrs, ValidateReplicationControllerStatus(controller.Status, field.NewPath("status"))...)
  	return allErrs
  }
docs: // ValidateReplicationControllerStatusUpdate tests if required fields in the replication controller are set.