Auto Scaling

Horizontal pod autoscaling does not apply to objects that can’t be scaled (for example: a DaemonSet.)
default interval for checking the resources is 15 seconds
API Version (2023 Jan): autoscaling/v2
Sample command: kubectl autoscale deployment example-app --cpu-percent=50 --min=1 --max=10

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: example-app
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: example-app
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Resource
    resource:
      name: cpu
      target:
        type: Utilization
        averageUtilization: 50

References:

[1]: Horizontal Pod Autoscaling | Kubernetes [2]: Autoscaling in Kubernetes | Kubernetes