I would expect that it is monitored based on planned flights e.g. airline tells airport we would like to operate X flights using Y a/c = Z number of seats and airport should be saying no, you need to reduce by Q% if the planning limited is exceeded. There maybe an adjustment made to take account of load factor e.g expected pax rather than availbale seats, but I would expect that it can only be managed in advance by the number of planned flights.