Enable Horizontal Pod Autoscaling

Horizontal Pod Autoscaling (HPA) is only supported by NF testnf-du-large.

Follow the below steps to enable it.

Prepare values.yml to have contents like this. The content follow the same format as https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/horizontal-pod-autoscaler-v2/#HorizontalPodAutoscalerSpec but without scaleTargetRef.

Note:

The following HPA content aligns with Kubernetes version v1.23+. For lower versions, please follow this guide https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/horizontal-pod-autoscaler-v1/#HorizontalPodAutoscalerSpec.

hpa:  
  maxReplicas: 2  
  minReplicas: 1
  metrics:  
  - resource:      
      name: cpu      
      target:        
        averageUtilization: 20        
        type: Utilization    
    type: Resource

Please make sure the selected nodepool where testnf-du-large would be onboarded has at least 2 nodes, otherwise the new scaled-up pod would be in pending status.
Follow TestNF DU Large Onboard and Instantiation Page to instantiate testnf-du-large and select the prepared values.yml.
Once testnf-du-large pod is running, you could use cyclictest tool in the testnf-du-large pod to increase the load and you will see a new pod is created.

➜  kubectl -n testnf-du-large exec -ti testnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-4m66p -- bash
root [ /opt/vmwaretools ]# cyclic-test-auto -D 5m -E 10
Duration=5m
Expected-max=10
log-off=0
out=/tmprun-cyclic-test -D 5m
➜  kubectl get pods -n testnf-du-large -w
NAME                                                     READY   STATUS    RESTARTS   AGE
testnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-4m66p   1/1     Running   0          14m
testnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-5nf9j   0/1     Pending   0          0s
testnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-5nf9j   0/1     Pending   0          0
stestnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-5nf9j   0/1     ContainerCreating   0          0s
testnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-5nf9j   0/1     ContainerCreating   0          2s
testnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-5nf9j   0/1     ContainerCreating   0          2s
testnf-du-l-cb47d-iu5ed-testnf-du-large-dcccb88d-5nf9j   1/1     Running             0          3s