describe.txt

$ kn describe hpa autoscale-demo
Name:			autoscale-demo
Namespace:		cloud
Reference:		Deployment/autoscale-demo
Metrics:		( current / target )
  "qps" on pods:	<unknown> / 1
Min replicas:		1
Max replicas:		5
Events:
  FirstSeen	LastSeen	Count	From				SubObjectPath	Type		Reason				Message
  ---------	--------	-----	----				-------------	--------	------				-------
  4m		14s		9	horizontal-pod-autoscaler			Warning		FailedGetPodsMetric		did not recieve metrics for any ready pods
  4m		14s		9	horizontal-pod-autoscaler			Warning		FailedComputeMetricsReplicas	failed to get pods metric value: did not recieve metrics for any ready pods

hpa.yaml

---
apiVersion: autoscaling/v2alpha1
kind: HorizontalPodAutoscaler
metadata:
  name: autoscale-demo
  namespace: cloud
spec:
  maxReplicas: 5
  minReplicas: 1
  metrics:
    - type: Pods
      pods:
        metricName: qps
        targetAverageValue: 1
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: autoscale-demo