anchor.diff:  
   %% NOTE: this is rpc:call-ed by mb_master of 2.0.0
   supported_compat_version() ->
  -    [2, 0].
  +    [3, 0].
   
   %% NOTE: this is rpc:call-ed by mb_master of 2.0.1+
   %%
  
positive.code: 
  is_enabled(FeatureVersion) ->
      is_enabled_at(get_compat_version(), FeatureVersion).
  
  is_index_aware_rebalance_on() ->
      Disabled = ns_config_ets_dup:unreliable_read_key(index_aware_rebalance_disabled, false),
  
negative.code: mb_master_advertised_version() ->
      [3, 0, 0].
  
  check_is_progress_tracking_supported() ->
      case is_cluster_30() of
          true -> true;
          _ ->
              case rpc:multicall(ns_node_disco:nodes_wanted(), cluster_compat_mode, mb_master_advertised_version, [], 30000) of
                  {Replies, []} ->
                      [R || R <- Replies,
                            R < [2, 0, 2]] =:= [];
                  _ ->
                      false
              end
      end.
  
  is_enabled_at(undefined = _ClusterVersion, _FeatureVersion) ->
  