OffBroadwayRedisStream.RedisClient.fetch

You're seeing just the callback fetch, go back to OffBroadwayRedisStream.RedisClient module for more information.
Link to this callback

fetch(demand, last_id, config)

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Specs

fetch(demand :: pos_integer(), last_id :: id(), config :: keyword()) ::
  {:ok, messages :: [message()]}
  | {:error, OffBroadwayRedisStream.RedisClient.ConnectionError.t()}
  | {:error, any()}