Yggdrasil.Subscriber.Distributor.start_link

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

start_link(channel, pid, options \\ [])

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Specs

Starts the supervisor and its children using the channel as part of the identificator for the supervision tree. It also receives the pid of the first subscriber. Additionally it can receive Supervisor options.