Merge pull request #103039 from tkashem/fix-102973

apf: calculation of dR/dt should use seats in use

staging/src/k8s.io/apiserver/pkg/util/flowcontrol/fairqueuing/queueset/queueset.go

@@ -413,17 +413,17 @@ func (qs *queueSet) syncTimeLocked() {
 // been advancing, according to the logic in `doc.go`.
 func (qs *queueSet) getVirtualTimeRatioLocked() float64 {
 	activeQueues := 0
-	reqs := 0
+	seatsInUse := 0
 	for _, queue := range qs.queues {
-		reqs += queue.requestsExecuting
+		seatsInUse += queue.seatsInUse
 		if queue.requests.Length() > 0 || queue.requestsExecuting > 0 {
 			activeQueues++
 		}
 	}
 	if activeQueues == 0 {
 		return 0
 	}
-	return math.Min(float64(reqs), float64(qs.dCfg.ConcurrencyLimit)) / float64(activeQueues)
+	return math.Min(float64(seatsInUse), float64(qs.dCfg.ConcurrencyLimit)) / float64(activeQueues)
 }
 
 // timeoutOldRequestsAndRejectOrEnqueueLocked encapsulates the logic required