Merge pull request #38320 from liggitt/golang-ratelimit

Automatic merge from submit-queue (batch tested with PRs 59158, 38320, 59059, 55516, 59357). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Switch from juju/ratelimit to golang.org/x/time/rate

Replaces juju/ratelimit with golang.org/x/time/rate
xref https://github.com/kubernetes/steering/issues/21

Requires removing the Saturation() method on the rate limiter. In the process of attempting to contribute it to the `golang.org/x/time/rate` implementation, it became clear that what it was calculating was not very useful when combined with periodic polling. See discussion in https://go-review.googlesource.com/c/time/+/29958#message-4caffc11669cadd90e2da4c05122cfec50ea6a22

```release-note
NONE
```

Kubernetes-commit: 0656d030a7d131ca8088a9f0ecd12596eb90d2fd

vendor/k8s.io/client-go/util/workqueue/BUILD

@@ -34,7 +34,7 @@ go_library(
     ],
     importpath = "k8s.io/client-go/util/workqueue",
     deps = [
-        "//vendor/github.com/juju/ratelimit:go_default_library",
+        "//vendor/golang.org/x/time/rate:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/util/clock:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
     ],

vendor/k8s.io/client-go/util/workqueue/default_rate_limiters.go

@@ -21,7 +21,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/juju/ratelimit"
+	"golang.org/x/time/rate"
 )
 
 type RateLimiter interface {
@@ -40,19 +40,19 @@ func DefaultControllerRateLimiter() RateLimiter {
 	return NewMaxOfRateLimiter(
 		NewItemExponentialFailureRateLimiter(5*time.Millisecond, 1000*time.Second),
 		// 10 qps, 100 bucket size.  This is only for retry speed and its only the overall factor (not per item)
-		&BucketRateLimiter{Bucket: ratelimit.NewBucketWithRate(float64(10), int64(100))},
+		&BucketRateLimiter{Limiter: rate.NewLimiter(rate.Limit(10), 100)},
 	)
 }
 
 // BucketRateLimiter adapts a standard bucket to the workqueue ratelimiter API
 type BucketRateLimiter struct {
-	*ratelimit.Bucket
+	*rate.Limiter
 }
 
 var _ RateLimiter = &BucketRateLimiter{}
 
 func (r *BucketRateLimiter) When(item interface{}) time.Duration {
-	return r.Bucket.Take(1)
+	return r.Limiter.Reserve().Delay()
 }
 
 func (r *BucketRateLimiter) NumRequeues(item interface{}) int {