code: public static Priority[] getAllPossiblePriorities()
      {
          return new Priority[]{
              Priority.FATAL, Priority.ERROR, Level.WARN,
              Priority.INFO, Priority.DEBUG, Level.TRACE
          };
      }
docs: Return all possible priorities as an array of Level objects in
  descending order.
  
  @deprecated This method will be removed with no replacement.
  @return TODO