Dynatrace containers livenessprobes switched from /healthz to /livez

[mjgrzybek]

Description

The /healthz endpoint for the livenessprobe is deprecated since Kubernetes 1.16. It's replaced by the more specific /livez.

How can this be tested?

Apply dynakube with cloudnativeFullstack:

apiVersion: dynatrace.com/v1beta1
kind: DynaKube
metadata:
  name: dk
  namespace: dynatrace
spec:
  apiUrl: <api_url>
  activeGate:
    capabilities:
    - kubernetes-monitoring
    - routing
  oneAgent:
    cloudNativeFullStack: {}

• see if all pods in dynatrace namespace are working correctly.
• check is no probe problems are visible in kubectl get events --sort-by='.lastTimestamp' -n dynatrace output
• check if /healthz is no longer used: kubectl -n dynatrace get pod -o yaml | grep healtz | wc -l

Checklist

• Unit tests have been updated/added
• PR is labeled accordingly

[dsch]

Does this change requires an update of the Kubernetes Monitoring Permissions as documented here:
https://www.dynatrace.com/support/help/setup-and-configuration/setup-on-container-platforms/kubernetes/get-started-with-kubernetes-monitoring/dt-component-permissions#dynatrace-kubernetes-monitoring-activegate