Amqpx.Queue.consumer_count

You're seeing just the function consumer_count, go back to Amqpx.Queue module for more information.
Link to this function

consumer_count(channel, queue)

Specs

consumer_count(Amqpx.Channel.t(), Amqpx.Basic.queue()) ::
  integer() | no_return()

Returns a number of active consumers on the queue.