- the `--make-symlinks` flag, deprecated in v1.14, has been removed. ([#80017](https://github.com/kubernetes/kubernetes/pull/80017), [@Pothulapati](https://github.com/Pothulapati))

- kube-apiserver

  - the `--basic-auth-file` flag and authentication mode is deprecated and will be removed in a future release. It is not recommended for production environments. ([#81152](https://github.com/kubernetes/kubernetes/pull/81152), [@tedyu](https://github.com/tedyu))

* Get public IP for Azure vmss nodes. ([#68498](https://github.com/kubernetes/kubernetes/pull/68498), [@feiskyer](https://github.com/feiskyer))
* test/integration: add a basic test for covering CronJobs ([#66937](https://github.com/kubernetes/kubernetes/pull/66937), [@mortent](https://github.com/mortent))

- The conformance tests:
  - Services should serve multiport endpoints from pods
  - Services should serve a basic endpoint from pods
  were only validating the API objects, not performing any validation on the actual Services implementation.

pkg debug/dwarf, method (*ArrayType) String() string
pkg debug/dwarf, method (*BasicType) Basic() *BasicType
pkg debug/dwarf, method (*BasicType) Common() *CommonType
pkg debug/dwarf, method (*BasicType) Size() int64
pkg debug/dwarf, method (*BasicType) String() string
pkg debug/dwarf, method (*BoolType) Basic() *BasicType
pkg debug/dwarf, method (*BoolType) Common() *CommonType
pkg debug/dwarf, method (*BoolType) Size() int64

* If CSINodeInfo and CSIMigration feature flags are active in the cluster, Kubelet will post NotReady until CSINode is initialized with basic volume plugin mechanism information for well-known drivers ([#74835](https://github.com/kubernetes/kubernetes/pull/74835), [@davidz627](https://github.com/davidz627))

- ACTION REQUIRED: Support for basic authentication via the --basic-auth-file flag has been removed.  Users should migrate to --token-auth-file for similar functionality. ([#89069](https://github.com/kubernetes/kubernetes/pull/89069), [@enj](https://github.com/enj)) [SIG API Machinery]

- Fixed bug in error messaging for basic-auth and ssh secret validations. ([#106179](https://github.com/kubernetes/kubernetes/pull/106179), [@vivek-koppuru](https://github.com/vivek-koppuru))

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#### Continuous Improvement
- Project sustainability is not just about features. Many SIGs have been working on  improving test coverage, ensuring the basics stay reliable, and stability of the core feature set and working on maturing existing features and cleaning up the backlog.

#### Extensibility

        * Use StatefulSet for Elasticsearch instead of ReplicationController, with persistent volume claims
        * Require authenticating towards Elasticsearch, as Elasticsearch 5.5 by default requires basic authentication
* Rebase hyperkube image on debian-hyperkube-base, based on debian-base. ([#48365](https://github.com/kubernetes/kubernetes/pull/48365), [@ixdy](https://github.com/ixdy))