- kubeadm: JoinConfiguration now houses the discovery options in a nested Discovery structure, which in turn has a couple of other nested structures to house more specific options (BootstrapTokenDiscovery and FileDiscovery) ([#67763](https://github.com/kubernetes/kubernetes/pull/67763), [@rosti](https://github.com/rosti))

<p>
For an equation of the form <code>X ≡<sub>A</sub> Y</code>,
where <code>X</code> and <code>Y</code> are types involved
in an assignment (including parameter passing and return statements),
the top-level type structures may unify loosely but element types
must unify exactly, matching the rules for assignments.
</p>

<p>
For an equation of the form <code>P ≡<sub>C</sub> C</code>,

### Structured Logging in Kubelet

pruning, or the automatic removal of unknown fields in objects sent to a Kubernetes API. An "unknown" field is one that is not specified in the OpenAPI validation schema. This behavior is already in place for native resources and ensures only data structures specified by the CRD developer are persisted to etcd. It will be available as a beta feature in Kubernetes 1.15.

Pruning is activated by setting `spec.preserveUnknownFields: false` in the CustomResourceDefinition. A future apiextensions.k8s.io/v1...

It is likely that `v1alpha2` will be removed in one of the future Kubernetes releases to be able to develop `v1`.

### Structured logging graduate to Beta

Structured logging reached its Beta milestone. Most log messages from kubelet and kube-scheduler have been converted. Users are encouraged to try out JSON output or parsing of the structured text format and provide feedback on possible solutions for the open issues, such as handling of multi-line strings in log values.

* ✨ Update OpenAPI models, supporting recursive models and extensions. PR [#3628](https://github.com/tiangolo/fastapi/pull/3628) by [@tiangolo](https://github.com/tiangolo).
* ✨ Import and re-export data structures from Starlette, used by Request properties, on `fastapi.datastructures`. Initial PR [#1872](https://github.com/tiangolo/fastapi/pull/1872) by [@jamescurtin](https://github.com/jamescurtin).

### Docs

- Migrate `proxy/ipvs/proxier.go` logs to structured logging. ([#97796](https://github.com/kubernetes/kubernetes/pull/97796), [@JornShen](https://github.com/JornShen))
- Migrate `staging/src/k8s.io/apiserver/pkg/registry` logs to structured logging. ([#98287](https://github.com/kubernetes/kubernetes/pull/98287), [@lala123912](https://github.com/lala123912))

## Dependencies

### Added
_Nothing has changed._

### Changed
- sigs.k8s.io/structured-merge-diff/v4: v4.0.3 → v4.1.2

### Removed
_Nothing has changed._



# v1.20.8


## Downloads for v1.20.8

### Source Code

filename | sha512 hash

- Migrate `volume/csi/csi-client.go` logs to structured logging. ([#99441](https://github.com/kubernetes/kubernetes/pull/99441), [@CKchen0726](https://github.com/CKchen0726))
- Migrate statefulset files to structured logging ([#106109](https://github.com/kubernetes/kubernetes/pull/106109), [@h4ghhh](https://github.com/h4ghhh))

 ([#64792](https://github.com/kubernetes/kubernetes/pull/64792), [@luxas](https://github.com/luxas))