anchor.diff:  %% gen_server callbacks
   -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
            terminate/2, code_change/3]).
  +
  +-ifdef(TEST).
  +-include_lib("eunit/include/eunit.hrl").
  +-endif.
   
   -record(cuml, {count =  0 :: integer(),
                  min        :: integer(),
  
positive.code:      {rebalance_delay_max,  RDelay#cuml.max},
       {rebalance_delay_mean, RDelay#cuml.mean},
       {rebalance_delay_last, RDelay#cuml.last}].
  
negative.code: %% @doc Produce a proplist-formatted view of the current aggregation
  %%      of stats.
  produce_stats(State, Moment) ->
      lists:append([gossip_stats(Moment, State),
                    vnodeq_stats()]).
  
  %% @spec spiral_minute(integer(), integer(), state()) -> integer()
  %% @doc Get the count of events in the last minute from the spiraltime
  