VintageNet.NameResolver.setup

You're seeing just the function setup, go back to VintageNet.NameResolver module for more information.
Link to this function

setup(ifname, domain, name_servers)

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Specs

setup(String.t(), String.t() | nil, [VintageNet.any_ip_address()]) :: :ok

Set the search domain and name server list for the specified interface.

This replaces any entries in the /etc/resolv.conf for this interface.