from pydantic import BaseModel

class Item(BaseModel):
    name: str
    price: Optional[float] = None
    owner_ids: Optional[List[int]] = None

app = FastAPI()

@app.get("/items/invalidnone", response_model=Union[Item, None])
def get_invalid_none():
    return None
```

work-in-progress for removing the in-tree provider. This work, being done in conjunction with SIG Cloud Provider, is focusing on moving internal APIs that the OpenStack (and other providers) depends upon to staging to guarantee API stability. This work also included abstracting the in-tree Cinder API and refactoring code to the external Cinder provider to remove additional Cinder volume provider code.

Additional work was also done to implement an OpenStack driver for the Cluster API effort lead...

### Autoscaling

- Horizontal Pod Autoscaling can now scale targets up even when one or more metrics are invalid/unavailable, as long as one metric indicates a scale up should occur. ([#78503](https://github.com/kubernetes/kubernetes/pull/78503), [@gjtempleton](https://github.com/gjtempleton))


### AWS

pkg syscall (netbsd-arm64-cgo), const IPPROTO_CARP = 112
pkg syscall (netbsd-arm64-cgo), const IPPROTO_CARP ideal-int
pkg syscall (netbsd-arm64-cgo), const IPPROTO_DONE = 257
pkg syscall (netbsd-arm64-cgo), const IPPROTO_DONE ideal-int
pkg syscall (netbsd-arm64-cgo), const IPPROTO_DSTOPTS = 60
pkg syscall (netbsd-arm64-cgo), const IPPROTO_DSTOPTS ideal-int
pkg syscall (netbsd-arm64-cgo), const IPPROTO_EGP = 8

  Depending on the value returned from QueueingHintFn, the scheduling queue changes how it queues each Pod:
  - if more than one QueueingHintFn returns QueueImmediately, it queues Pod to activeQ.
  - If no QueueingHintFn returns QueueImmediately and more than one plugin returns QueueAfterBackoff, it queues Pod to backoffQ if Pod is backing off, or to activeQ if Pod's backoff has already finished.

pkg syscall (darwin-arm64), const IPPROTO_DIVERT = 254
pkg syscall (darwin-arm64), const IPPROTO_DIVERT ideal-int
pkg syscall (darwin-arm64), const IPPROTO_DONE = 257
pkg syscall (darwin-arm64), const IPPROTO_DONE ideal-int
pkg syscall (darwin-arm64), const IPPROTO_DSTOPTS = 60
pkg syscall (darwin-arm64), const IPPROTO_DSTOPTS ideal-int
pkg syscall (darwin-arm64), const IPPROTO_EGP = 8

### Bug or Regression

- Fix component status calling etcd health endpoint over http which exposed kubernetes to the risk of complete watch starvation and is inconsistent with other etcd probing done by kube-apiserver. ([#118683](https://github.com/kubernetes/kubernetes/pull/118683), [@serathius](https://github.com/serathius)) [SIG API Machinery]

* [Breaking change, client-go]: The WaitFor function returns, probably an ErrWaitTimeout, when the done channel is closed, even if the `WaitFunc` doesn't handle the done channel. ([#72364](https://github.com/kubernetes/kubernetes/pull/72364), [@kdada](https://github.com/kdada))

- Azure nodes with availability zone will now have label `failure-domain.beta.kubernetes.io/zone=<region>-<zoneID>`. ([#66242](https://github.com/kubernetes/kubernetes/pull/66242), [@feiskyer](https://github.com/feiskyer)) Courtesy of SIG Azure

* The old dynamic client has been replaced by a new one.  The previous dynamic client will exist for one release in `client-go/deprecated-dynamic`.  Switch as soon as possible. ([#63446](https://github.com/kubernetes/kubernetes/pull/63446), [@deads2k](https://github.com/deads2k))