diff --git a/staging/src/k8s.io/apiserver/pkg/admission/metrics/metrics.go b/staging/src/k8s.io/apiserver/pkg/admission/metrics/metrics.go
index a5ab97a74d52..d5514ed86a40 100644
--- a/staging/src/k8s.io/apiserver/pkg/admission/metrics/metrics.go
+++ b/staging/src/k8s.io/apiserver/pkg/admission/metrics/metrics.go
@@ -153,19 +153,31 @@ func (m *AdmissionMetrics) ObserveWebhook(elapsed time.Duration, rejected bool,
 }
 
 type metricSet struct {
-	latencies        *prometheus.HistogramVec
-	latenciesSummary *prometheus.SummaryVec
+	latencies                  *prometheus.HistogramVec
+	deprecatedLatencies        *prometheus.HistogramVec
+	latenciesSummary           *prometheus.SummaryVec
+	deprecatedLatenciesSummary *prometheus.SummaryVec
 }
 
 func newMetricSet(name string, labels []string, helpTemplate string, hasSummary bool) *metricSet {
-	var summary *prometheus.SummaryVec
+	var summary, deprecatedSummary *prometheus.SummaryVec
 	if hasSummary {
 		summary = prometheus.NewSummaryVec(
 			prometheus.SummaryOpts{
 				Namespace: namespace,
 				Subsystem: subsystem,
 				Name:      fmt.Sprintf("%s_admission_latencies_seconds_summary", name),
-				Help:      fmt.Sprintf(helpTemplate, "latency summary"),
+				Help:      fmt.Sprintf(helpTemplate, "latency summary in seconds"),
+				MaxAge:    latencySummaryMaxAge,
+			},
+			labels,
+		)
+		deprecatedSummary = prometheus.NewSummaryVec(
+			prometheus.SummaryOpts{
+				Namespace: namespace,
+				Subsystem: subsystem,
+				Name:      fmt.Sprintf("%s_admission_latencies_milliseconds_summary", name),
+				Help:      fmt.Sprintf("(Deprecated) "+helpTemplate, "latency summary in milliseconds"),
 				MaxAge:    latencySummaryMaxAge,
 			},
 			labels,
@@ -178,37 +190,61 @@ func newMetricSet(name string, labels []string, helpTemplate string, hasSummary
 				Namespace: namespace,
 				Subsystem: subsystem,
 				Name:      fmt.Sprintf("%s_admission_latencies_seconds", name),
-				Help:      fmt.Sprintf(helpTemplate, "latency histogram"),
+				Help:      fmt.Sprintf(helpTemplate, "latency histogram in seconds"),
+				Buckets:   latencyBuckets,
+			},
+			labels,
+		),
+		deprecatedLatencies: prometheus.NewHistogramVec(
+			prometheus.HistogramOpts{
+				Namespace: namespace,
+				Subsystem: subsystem,
+				Name:      fmt.Sprintf("%s_admission_latencies_milliseconds", name),
+				Help:      fmt.Sprintf("(Deprecated) "+helpTemplate, "latency histogram in milliseconds"),
 				Buckets:   latencyBuckets,
 			},
 			labels,
 		),
 
-		latenciesSummary: summary,
+		latenciesSummary:           summary,
+		deprecatedLatenciesSummary: deprecatedSummary,
 	}
 }
 
 // MustRegister registers all the prometheus metrics in the metricSet.
 func (m *metricSet) mustRegister() {
 	prometheus.MustRegister(m.latencies)
+	prometheus.MustRegister(m.deprecatedLatencies)
 	if m.latenciesSummary != nil {
 		prometheus.MustRegister(m.latenciesSummary)
 	}
+	if m.deprecatedLatenciesSummary != nil {
+		prometheus.MustRegister(m.deprecatedLatenciesSummary)
+	}
 }
 
 // Reset resets all the prometheus metrics in the metricSet.
 func (m *metricSet) reset() {
 	m.latencies.Reset()
+	m.deprecatedLatencies.Reset()
 	if m.latenciesSummary != nil {
 		m.latenciesSummary.Reset()
 	}
+	if m.deprecatedLatenciesSummary != nil {
+		m.deprecatedLatenciesSummary.Reset()
+	}
 }
 
 // Observe records an observed admission event to all metrics in the metricSet.
 func (m *metricSet) observe(elapsed time.Duration, labels ...string) {
+	elapsedSeconds := elapsed.Seconds()
 	elapsedMicroseconds := float64(elapsed / time.Microsecond)
-	m.latencies.WithLabelValues(labels...).Observe(elapsedMicroseconds)
+	m.latencies.WithLabelValues(labels...).Observe(elapsedSeconds)
+	m.deprecatedLatencies.WithLabelValues(labels...).Observe(elapsedMicroseconds)
 	if m.latenciesSummary != nil {
-		m.latenciesSummary.WithLabelValues(labels...).Observe(elapsedMicroseconds)
+		m.latenciesSummary.WithLabelValues(labels...).Observe(elapsedSeconds)
+	}
+	if m.deprecatedLatenciesSummary != nil {
+		m.deprecatedLatenciesSummary.WithLabelValues(labels...).Observe(elapsedMicroseconds)
 	}
 }