anchor.diff:      NumOfVNodes = leo_misc:get_value('num_of_vnodes', State, -1),
       GrpLevel2   = leo_misc:get_value('grp_level_2',   State, []),
       Directories = leo_misc:get_value('dirs',          State, []),
  +    LogLevel    = leo_misc:get_value('log_level',     State, []),
       RingHashes  = leo_misc:get_value('ring_checksum', State, []),
       Statistics  = leo_misc:get_value('statistics',    State, []),
       MsgQueue    = leo_misc:get_value('storage', Statistics, []),
  
positive.code:                   {<<"grp_level_2">>,      leo_misc:any_to_binary(GrpLevel2)},
                    {<<"rack_id">>,          leo_misc:any_to_binary(GrpLevel2)},
                    {<<"log_dir">>,          leo_misc:any_to_binary(leo_misc:get_value('log', Directories, []))},
                    {<<"ring_cur">>,         leo_misc:any_to_binary(leo_hex:integer_to_hex(leo_misc:get_value('ring_cur',  RingHashes, 0), 8))},
                    {<<"ring_prev">>,        leo_misc:any_to_binary(leo_hex:integer_to_hex(leo_misc:get_value('ring_prev', RingHashes, 0), 8))},
                    {<<"vm_version">>,       leo_misc:any_to_binary(leo_misc:get_value('vm_version', Statistics, []))},
  
negative.code:                   %% config-1
                    {<<"version">>, leo_misc:any_to_binary(Version)},
                    {<<"log_dir">>, leo_misc:any_to_binary(leo_misc:get_value('log', Directories, []))},
                    {<<"log_level">>, leo_misc:any_to_binary(LogLevel)},
  
                    %% config-2
                    {<<"ring_cur">>,  leo_misc:any_to_binary(
  