// again with the same metric for a specific converter (e.g. 'webhook').
	durations   map[string]*metrics.HistogramVec
	factoryLock sync.Mutex
}

func newConverterMetricFactory() *converterMetricFactory {
	return &converterMetricFactory{durations: map[string]*metrics.HistogramVec{}, factoryLock: sync.Mutex{}}
}

var _ crConverterInterface = &converterMetric{}

	webhookConverterFactory *webhookConverterFactory
}

// converterMetricFactorySingleton protects us from reregistration of metrics on repeated
// apiextensions-apiserver runs.
var converterMetricFactorySingleton = newConverterMetricFactory()

// NewCRConverterFactory creates a new CRConverterFactory
func NewCRConverterFactory(serviceResolver webhook.ServiceResolver, authResolverWrapper webhook.AuthenticationInfoResolverWrapper) (*CRConverterFactory, error) {