- 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))

*   You can now add "options" to the host's /etc/resolv.conf (or --resolv-conf), and they will be copied into pod's resolv.conf when dnsPolicy is Default. Being able to customize options is important because it is common to leverage options to fine-tune the behavior of DNS client. ([#54773](https://github.com/kubernetes/kubernetes/pull/54773),[ @phsiao](https://github.com/phsiao))...

rate limit is switched to per-client. A set of new rate limit configure options are introduced, including routeRateLimit, SubnetsRateLimit, InterfaceRateLimit, RouteTableRateLimit, LoadBalancerRateLimit, PublicIPAddressRateLimit, SecurityGroupRateLimit, VirtualMachineRateLimit, StorageAccountRateLimit, DiskRateLimit, SnapshotRateLimit, VirtualMachineScaleSetRateLimit and VirtualMachineSizeRateLimit. The original rate limit options would be default values for those new client's rate limiter. ([#8651...

* Add override flags options to kubefed init ([#40917](https://github.com/kubernetes/kubernetes/pull/40917), [@irfanurrehman](https://github.com/irfanurrehman))
* Add option to expose federation apiserver on nodeport service ([#40516](https://github.com/kubernetes/kubernetes/pull/40516), [@shashidharatd](https://github.com/shashidharatd))

#### Storage

* [stable] Mount options

  * The ability to specify mount options for volumes is moved from beta to stable.

  * A new `MountOptions` field in the `PersistentVolume` spec is available to specify mount options. This field replaces an annotation.

  * A new `MountOptions` field in the `StorageClass` spec allows configuration of mount options for dynamically provisioned volumes.

* etcd client add dial timeout. ([#61459](https://github.com/kubernetes/kubernetes/pull/61459), [@hzxuzhonghu](https://github.com/hzxuzhonghu))
* nil admission options are now consistent with other nil options. ([#63993](https://github.com/kubernetes/kubernetes/pull/63993), [@tamalsaha](https://github.com/tamalsaha))

- Pod eviction now honors graceful deletion by default if no delete options are provided in the eviction request. ([#72730](https://github.com/kubernetes/kubernetes/pull/72730), [@liggitt](https://github.com/liggitt))

### Auth

* kubeadm now has a join timeout that can be controlled via the `discoveryTimeout` config option. This option is set to 5 minutes by default. ([#60983](https://github.com/kubernetes/kubernetes/pull/60983), [@rosti](https://github.com/rosti))

  and it can be enabled by setting the option `--feature-gates=AllowUnsafeMalformedObjectDeletion=true`.
  It comes with an API change, a new delete option `ignoreStoreReadErrorWithClusterBreakingPotential` has
  been introduced, it is not set by default, this maintains backward compatibility.
  In order to perform an unsafe deletion of a corrupt resource, the user must enable the option for the delete

    * `kubectl create configmap` has a new option `--from-env-file` that populates a configmap from file which follows a key=val format for each line. ([#38882](https://github.com/kubernetes/kubernetes/pull/38882), [@fraenkel](https://github.com/fraenkel))

    * `kubectl create secret` has a new option `--from-env-file` that populates a secret from file which follows a key=val format for each line.