The Elixir documentation for start_link(module, fun, args, options \\ []) doesn’t have any example on how to use it:

@spec start_link(module(), atom(), [any()], GenServer.options()) :: on_start()

Starts an agent linked to the current process.

Same as start_link/2 but a module, function, and arguments are expected instead of an 
anonymous function; fun in module will be called with the given arguments args to initialize the state.

My current code to initialize the Agent with a module name:

defmodule UdpServer.ServersAgent do
  use Agent
  alias UdpServer.ServersAgent

  defstruct [
    servers: %{},
    tracked_packets: %{},
  ]

  def start_link(args) do
    IO.inspect(args, label: "SERVERS ARGS")
    # Agent.start_link(fn -> %ServersAgent{} end, name: __MODULE__)
    Agent.start_link(__MODULE__, :initial_state, args)
  end

  # Function isn't called as the docs seems to say.
  def initial_state(args) do
    IO.puts("initial_state/1")
    %ServersAgent{}
  end

  # Function its called but the Agent isn't started 
  def initial_state() do
    IO.puts("initial_state/0")
    #  %ServersAgent{}
    fn -> %ServersAgent{} end
  end

  ### omitted some code ... ###
end

What am I missing or doing wrong?