Scheduler metrics: binding rate limiter saturation

plugin/pkg/scheduler/scheduler.go

@@ -77,6 +77,7 @@ type Config struct {
 	Binder     Binder
 
 	// Rate at which we can create pods
+	// If this field is nil, we don't have any rate limit.
 	BindPodsRateLimiter util.RateLimiter
 
 	// NextPod should be a function that blocks until the next pod
@@ -107,6 +108,12 @@ func New(c *Config) *Scheduler {
 
 // Run begins watching and scheduling. It starts a goroutine and returns immediately.
 func (s *Scheduler) Run() {
+	if s.config.BindPodsRateLimiter != nil {
+		go util.Forever(func() {
+			sat := s.config.BindPodsRateLimiter.Saturation()
+			metrics.BindingRateLimiterSaturation.Set(sat)
+		}, metrics.BindingSaturationReportInterval)
+	}
 	go util.Until(s.scheduleOne, 0, s.config.StopEverything)
 }