def consumergroups
      @consumergroups ||= begin
        consumers = zk.get_children(path: "/consumers")
        consumers.fetch(:children).map { |name| Kazoo::Consumergroup.new(self, name) }
      end
    end
def consumergroups
      @consumergroups ||= begin
        consumers = zk.get_children(path: "/consumers")
        consumers.fetch(:children).map { |name| Kazoo::Consumergroup.new(self, name) }
      end
    end
Returns a list of consumer groups that are registered against the Kafka cluster.