each_pool_config

# File activerecord/lib/active_record/connection_adapters/pool_manager.rb, line 26
      def each_pool_config(role = nil, &block)
        if role
          @role_to_shard_mapping[role].each_value(&block)
        else
          @role_to_shard_mapping.each_value do |shard_map|
            shard_map.each_value(&block)
          end
        end
      end