var (
	// RequestLatency is a prometheus metric which is a histogram of the latency
	// of processing admission requests.
	RequestLatency = prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Name:                            "controller_runtime_webhook_latency_seconds",
			Help:                            "Histogram of the latency of processing admission requests",
			NativeHistogramBucketFactor:     1.1,
			NativeHistogramMaxBucketNumber:  100,
			NativeHistogramMinResetDuration: 1 * time.Hour,
		},
		[]string{"webhook"},
	)

	// RequestTotal is a prometheus metric which is a counter of the total processed admission requests.
	RequestTotal = func() *prometheus.CounterVec {
		return prometheus.NewCounterVec(
			prometheus.CounterOpts{
				Name: "controller_runtime_webhook_requests_total",
				Help: "Total number of admission requests by HTTP status code.",
			},
			[]string{"webhook", "code"},
		)
	}()

	// RequestInFlight is a prometheus metric which is a gauge of the in-flight admission requests.
	RequestInFlight = func() *prometheus.GaugeVec {
		return prometheus.NewGaugeVec(
			prometheus.GaugeOpts{
				Name: "controller_runtime_webhook_requests_in_flight",
				Help: "Current number of admission requests being served.",
			},
			[]string{"webhook"},
		)
	}()
)