VintageNet.OSEventDispatcher.UdhcpdHandler.lease_update

You're seeing just the callback lease_update, go back to VintageNet.OSEventDispatcher.UdhcpdHandler module for more information.
Link to this callback

lease_update(arg1, arg2)

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Specs

lease_update(VintageNet.ifname(), Path.t()) :: :ok

The DHCP lease file was updated