HPA targets invalid object

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Metadata

Id: kubernetes-hpa-targets-invalid-object

Platform: Kubernetes

Severity: Low

Category: Availability

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Description

The HorizontalPodAutoscaler must target a valid object. This rule verifies each entry in spec.metrics with type: "Object" includes the required fields: object.metric, object.target, and object.describedObject with name, apiVersion, and kind. If any of these fields are missing, the metric is considered invalid.

Compliant Code Examples

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: php-apache
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: php-apache
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Object
    object:
      metric:
        name: requests-per-second
      describedObject:
        apiVersion: networking.k8s.io/v1beta1
        kind: Ingress
        name: main-route
      target:
        type: Value
        value: 10k

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: matching-svc
  namespace: default
spec:
  metrics:
    - resource:
        name: cpu
        target:
          averageUtilization: 50
          type: Utilization
      type: Resource
  minReplicas: 1
  maxReplicas: 5
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: matching-svc

Non-Compliant Code Examples

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: php-apache
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: php-apache
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Object
    object:
      metric:
        name: requests-per-second
      target:
        type: Value
        value: 10k
      describedObject:
        apiVersion: networking.k8s.io/v1beta1
        kind: Ingress