anchor.diff:              LogLevel = ?env_log_level(leo_manager),
               ok = leo_logger_client_message:new(
                      LogDir, LogLevel, log_file_appender()),
  -
  -            %% Launch Statistics
  -            ok = leo_statistics_api:start_link(leo_manager),
  -            ok = leo_metrics_vm:start_link(?SNMP_SYNC_INTERVAL_10S),
   
               %% Launch MQ
               ok = leo_manager_mq_client:start(?MODULE, [], ?env_queue_dir()),
  
positive.code:     end.
  
  
  
  
  
  %% @spec () -> ok |
  %%             not_started
  %% @doc stop process.
  
negative.code:     ok.
  
  
  %% @doc Get log-file appender from env
  %% @private
  -spec(log_file_appender() ->
  