https://github.com/ytti/oxidized/blob/0cf095b01612c30a635a6c26843f02af20631823/lib/oxidized/manager.rb#L57-L62
https://github.com/ytti/oxidized/blob/0cf095b01612c30a635a6c26843f02af20631823/lib/oxidized/nodes.rb#L158-L171
