func (c *ConcurrentRetrier) Throttle() {
	c.throttleInternal()
}
Throttle Sleep if there were failures since the last success call.
package backoff
import (
	"context"
	"sync"
	"time"
)
type (
	Operation func() error
	IsRetryable func(error) bool
	ConcurrentRetrier struct {
		sync.Mutex
		retrier      Retrier  
		failureCount int64    
	}
)