Yggdrasil.Subscriber.Adapter.start_link

You're seeing just the callback start_link, go back to Yggdrasil.Subscriber.Adapter module for more information.
Link to this callback

start_link(channel, options)

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Specs

start_link(channel :: Yggdrasil.Channel.t(), options :: GenServer.options()) ::
  GenServer.on_start()

Callback to start a subscriber with a channel, a publisher and some GenServer options.