KIM supports configuring kube-controller-manager params

[ebensom]

Description

KIM should provide support for reconciling the .spec.kubernetes.kubeControllermanager params of all shoot workers based on equal configuration in the runtime CR. The prominent configurations to support:

kubeControllerManager:
  featureGates:
    ...
  nodeMonitorGracePeriod: 40s
  horizontalPodAutoscaler:
    ..

KIM should have a default configuration to fill out the kubeControllerManager.nodeMonitorGracePeriod param, when not provided via Runtime CR spec. The other attributes are not important to have default configuration.

AC:

• Extend RuntimeCR to support the required information needed to configure the kubeControllermanager section in the Shoot-Spec
• Implement required logic which adds the related configuration for kubeControllermanager into a Shoot-Spec

Reasons

Ability to tune kube-controller-manager settings, as theys often influence K8s data plane reliability.

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