code: def _fsic_queuing_calc(fsic1, fsic2):
      
      return {instance: fsic2.get(instance, 0) for instance, counter in six.iteritems(fsic1) if fsic2.get(instance, 0) < counter}
docs: We set the lower counter between two same instance ids.
      If an instance_id exists in one fsic but not the other we want to give that counter a value of 0.
  
      :param fsic1: dictionary containing (instance_id, counter) pairs
      :param fsic2: dictionary containing (instance_id, counter) pairs
      :return ``dict`` of fsics to be used in queueing the correct records to the buffer