dealer, err := checkConfig(qCfg)
	if err != nil {
		return nil, err
	}
	return &queueSetCompleter{
		factory:              qsf,
		reqsGaugePair:        reqsGaugePair,
		execSeatsGauge:       execSeatsGauge,
		seatDemandIntegrator: seatDemandIntegrator,
		qCfg:                 qCfg,
		dealer:               dealer}, nil
}

// checkConfig returns a non-nil Dealer if the config is valid and