apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: nginx-hpa-behavior-default-test
spec:

  # 绑定需要自动扩缩的资源对象，如deployment/statefulset等

  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: nginx-hpa-test

  # 设置扩缩时的最大最小副本数

  minReplicas: 1
  maxReplicas: 5

  # 设置扩缩参考的指标（可设置多个指标）

  # 这里的指标表示期望的Pod总负载的平均CPU利用率为50%左右，若超出则考虑增加Pod数量，若不足则考虑减少Pod数量

  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 50
  behavior: # 以下是K8s默认的扩缩行为配置
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
        - type: Percent
          value: 100
          periodSeconds: 15
    scaleUp:
      stabilizationWindowSeconds: 0
      policies:
        - type: Percent
          value: 100
          periodSeconds: 15
        - type: Pods
          value: 4
          periodSeconds: 15
      selectPolicy: Max