anchor.diff:    app_name,                 % name of the app this bee supports
     host,
     port,
  +  routing_param,            % meta data on the bee allows for more granualar abstract parameters
  +                            % should be a tuple, e.g. {ports: 2}
     start_time,               % starting time
     pid,                      % pid of os port process
     sticky        = false,    % keep this bee around, don't remove it from the bee list if it dies
  
positive.code: 
  % EVENTS
  -define (EVENT_MANAGER, event_manager).
  -define (EVENT_HANDLERS, [log_event_handler, app_event_handler, proxy_event_handler, bee_event_handler]).
  -define (NOTIFY (Event), ?EVENT_MANAGER:notify(Event)).
  
  % Port to start on
  
negative.code:   path,
    url,
    concurrency,
    routing_param = undefined,       % determine the method of choosing the backend
    timeout,
    min_instances,
    max_instances,
  