},
		[]string{priorityLevel, flowSchema},
	)
	// PriorityLevelExecutionSeatsGaugeVec creates observers of seats occupied throughout execution for priority levels
	PriorityLevelExecutionSeatsGaugeVec = NewTimingRatioHistogramVec(
		&compbasemetrics.TimingHistogramOpts{
			Namespace: namespace,
			Subsystem: subsystem,
			Name:      "priority_level_seat_utilization",

// the initial ratio (which is obviously a non-issue when both are zero).
// Note the difficulties associated with extracting a member
// before registering the vector.
func NewTimingRatioHistogramVec(opts *compbasemetrics.TimingHistogramOpts, labelNames ...string) *TimingRatioHistogramVec {
	return NewTestableTimingRatioHistogramVec(time.Now, opts, labelNames...)
}