// +optional
  optional int32 availableReplicas = 5;

  // ObservedGeneration reflects the generation of the most recently observed replication controller.
  // +optional
  optional int64 observedGeneration = 3;

  // Represents the latest available observations of a replication controller's current state.
  // +optional
  // +patchMergeKey=type

* DaemonSet controller actively kills failed pods (to recreate them) ([#40330](https://github.com/kubernetes/kubernetes/pull/40330), [@janetkuo](https://github.com/janetkuo))
* DaemonSet ObservedGeneration ([#39157](https://github.com/kubernetes/kubernetes/pull/39157), [@lukaszo](https://github.com/lukaszo))

### Deployment

- `kubectl wait` ensures that observedGeneration >= generation to prevent stale state reporting. An example scenario can be found on CRD updates. ([#97408](https://github.com/kubernetes/kubernetes/pull/97408), [@KnicKnic](https://github.com/KnicKnic))

### Documentation

- Fix k8s.io/apimachinery/pkg/api/meta.SetStatusCondition to update ObservedGeneration ([#95961](https://github.com/kubernetes/kubernetes/pull/95961), [@KnicKnic](https://github.com/KnicKnic)) [SIG API Machinery]

* Rebase hyperkube image on debian-hyperkube-base, based on debian-base. ([#48365](https://github.com/kubernetes/kubernetes/pull/48365), [@ixdy](https://github.com/ixdy))
* change apps/v1beta2 StatefulSet observedGeneration (optional field) from a pointer to an int for consistency ([#49607](https://github.com/kubernetes/kubernetes/pull/49607), [@dixudx](https://github.com/dixudx))