Resources should define a `.status.observedGeneration` field, and controllers should update its value

[dlipovetsky]

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/kind feature

Describe the solution you'd like I update the .spec of a custom resource whose .status is written by a CAPA controller. For example, the AWSManagedControlPlane resource.

I expect the controller to set the .status.observedGeneration field when the controller reconciles the resource.

I need to compare .status.observedGeneration with .metadata.generation to know whether the .status reflects the current, or an outdated .spec.

Anything else you would like to add: The EKSConfig resource defines a status.observedGeneration, and the EKSConfig controller sets the field. No other CAPA resource does.

Environment:

• Cluster-api-provider-aws version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):