Explain Openshift resource manifest

[Chetan_Tiwary_]

Explain this openshift resource manifest

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: hpa-resource-metrics-memory
  namespace: default
spec:
...
  minReplicas: 20
...
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
      - type: Pods
        value: 4
        periodSeconds: 30
      - type: Percent
        value: 10
        periodSeconds: 60
      selectPolicy: Max
    scaleUp:
      selectPolicy: Disabled

[Kent-Kamau]

The provided resource manifest is for a HorizontalPodAutoscaler (HPA) which automatically scales the number of pods in a deployment or replica set based on observed resource usage or other metrics.

This HorizontalPodAutoscaler is set to:

1. Minimum Replicas: Always maintain at least 20 pods.
2. Scale Down Behavior: After scaling down, wait for 5 minutes before considering another scale-down event.
3. Limit scale-down actions to a maximum of 4 pods within 30 seconds or 10% of the total pods within 60 seconds, whichever is greater.
4. The Max scaling policy ensures that the largest scale-down value will be applied.
5. Scale Up Behavior: Scaling up is disabled for this HPA, meaning no new pods will be added even if resource usage increases.

[juicylemon]

This configuration helps manage the number of replicas in response to changing workload demands while preventing rapid scaling oscillations.
Minimum 20 replicas running, scalling down is gradually with 10% cut down every minute or 4 pods every 30 seconds, which ever is bigger.
Scaling up targeting utilization without specific policy.