// APIVersion field. It is necessary to track the version of a field
  // set because it cannot be automatically converted.
  optional string apiVersion = 3;

  // Time is the timestamp of when the ManagedFields entry was added. The
  // timestamp will also be updated if a field is added, the manager
  // changes any of the owned fields value or removes a field. The
  // timestamp does not update when a field is removed from the entry