- The certificate signer no longer accepts ca.key passwords via the `CFSSL_CA_PK_PASSWORD` environment variable. This capability was not prompted by user request, never advertised, and recommended against in the security audit. ([#84677](https://github.com/kubernetes/kubernetes/pull/84677), [@mikedanese](https://github.com/mikedanese))...

* Restores --username and --password flags to kubectl ([#75451](https://github.com/kubernetes/kubernetes/pull/75451), [@liggitt](https://github.com/liggitt))

* Allow the system:heapster ClusterRole read access to deployments ([#48357](https://github.com/kubernetes/kubernetes/pull/48357), [@faraazkhan](https://github.com/faraazkhan))
* Ensure get_password is accessing a file that exists. ([#48351](https://github.com/kubernetes/kubernetes/pull/48351), [@ktsakalozos](https://github.com/ktsakalozos))

* kube-apiserver: the experimental in-tree Keystone password authenticator has been removed in favor of extensions that enable use of Keystone tokens. ([#59492](https://github.com/kubernetes/kubernetes/pull/59492), [@dims](https://github.com/dims))

## Changelog since v1.13.4

### Other notable changes

* Restores --username and --password flags to kubectl ([#75451](https://github.com/kubernetes/kubernetes/pull/75451), [@liggitt](https://github.com/liggitt))

* Node-Problem-Detector configuration is now decoupled from the Kubernetes release on GKE/GCE. ([#73288](https://github.com/kubernetes/kubernetes/pull/73288), [@wangzhen127](https://github.com/wangzhen127))
* Restores --username and --password flags to kubectl ([#75451](https://github.com/kubernetes/kubernetes/pull/75451), [@liggitt](https://github.com/liggitt))

Support for Windows nodes and Windows containers went going stable.

Support for Group Managed Service Accounts (GMSA) for Windows containers in Kubernetes. GMSA are a specific type of Active Directory account that provides automatic password management, simplified service principal name (SPN) management, and the ability to delegate the management to other administrators across multiple servers.

* Support graceful termination in kube-dns ([#31894](https://github.com/kubernetes/kubernetes/pull/31894), [@MrHohn](https://github.com/MrHohn))
* When prompting for passwords, don't echo to the terminal ([#31586](https://github.com/kubernetes/kubernetes/pull/31586), [@brendandburns](https://github.com/brendandburns))