VintageNet.Route.InterfaceInfo.metric

You're seeing just the function metric, go back to VintageNet.Route.InterfaceInfo module for more information.
Link to this function

metric(info, prioritization)

View Source

Specs

metric(t(), [
  {:_ | :ethernet | :local | :mobile | :unknown | :wifi,
   :_ | :disconnected | :internet | :lan}
]) :: :disabled | pos_integer()