anchor.diff:  -define(SEND_TO_GROUP_MEMBER(Pid, Process, Msg),
           comm:send(Pid, Msg, [{group_member, Process}, {shepherd, self()}])).
   
  -%% -define(SHOW, config:read(log_level)).
  --define(SHOW, debug).
  +-define(SHOW, config:read(log_level)).
  +%% -define(SHOW, debug).
   
   -define(CBMODULES, [{gossip_load, default}]). % callback modules as list
   -define(CBMODULES_TYPE, {gossip_load, default}). % callback modules as union of atoms
  
positive.code: 
  % called by dht_node_join, results in on_active
  -spec activate(Range::intervals:interval()) -> ok.
  activate(MyRange) ->
      Pid = pid_groups:get_my(gossip2),
      comm:send_local(Pid, {activate_gossip, MyRange}).
  
  
  %% @doc Deactivates all gossip processes.
  
negative.code: -export([start_link/1, activate/1, deactivate/0, start_gossip_task/2, stop_gossip_task/1, remove_all_tombstones/0]).
  
  % interaction with the ring maintenance:
  -export([rm_filter_slide_msg/3, rm_send_activation_msg/4, rm_my_range_changed/3, rm_send_new_range/4]).
  
  % testing
  -export([tester_create_state/9, is_state/1]).
  