systemd moved the option. See 8ebafba9f9 . Implements #123. Document in comments why the route metrics need to be set (because of https://github.com/systemd/systemd/issues/17698 ) and use the same metric values as NetworkManager. https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/src/core/devices/nm-device.c Additionally remove RouteMetric from configs/baseline/airootfs/etc/systemd/network/20-ethernet.network. There is only one networkd configuration file in baseline, meaning, there are no other routes.
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