public static Allocation newRoot(String description, long allocationUnits) {
    return new Allocation(description, allocationUnits, null);
  }
Creates a new root {@link Allocation}.

@param description user-facing description of what the allocation represents
@param allocationUnits number of allocation units
@return a new {@link Allocation}
jib-core/src/main/java/com/google/cloud/tools/jib/event/progress/Allocation.java