- Fixed a regression since `v1.27.0` in the scheduler framework when running score plugins. 
  The `skippedScorePlugins` number might be greater than `enabledScorePlugins`, 
  so when initializing a slice the `cap(len(skippedScorePlugins) - len(enabledScorePlugins))` is negative, 
  which is not allowed. ([#121632](https://github.com/kubernetes/kubernetes/pull/121632), [@kerthcet](https://github.com/kerthcet))

- Fix controller-manager crashes when flex plugin is removed from flex plugin directory ([#65536](https://github.com/kubernetes/kubernetes/pull/65536), [@gnufied](https://github.com/gnufied))

  * You can now set `VolumeMount.Propagation` to `Bidirectional` to enable a particular mount for a container to propagate itself to the host or other containers.

* [alpha] Improve Flex volume deployment

  * Flex volume driver deployment is simplified in the following ways:

    * New driver files can now be automatically discovered and initialized without requiring a kubelet or controller-manager restart.

        "english_keywords": {
          "type":       "keyword_marker",
          "keywords": ["sample"]
        },
        "finnish_stop": {
          "type":       "stop",

        "english_keywords": {
          "type":       "keyword_marker",
          "keywords": ["sample"]
        },
        "finnish_stop": {
          "type":       "stop",

- Kubeadm: always mount the kube-controller-manager hostPath volume that is given by the `--flex-volume-plugin-dir` flag. ([#84468](https://github.com/kubernetes/kubernetes/pull/84468), [@neolit123](https://github.com/neolit123))

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was quite impossible to say whether the blows hurt it or not.

  `Oh, PLEASE mind what you're doing!' cried Alice, jumping up
and down in an agony of terror.  `Oh, there goes his PRECIOUS
nose'; as an unusually large saucepan flew close by it, and very
nearly carried it off.

  `If everybody minded their own business,' the Duchess said in a
hoarse growl, `the world would go round a deal faster than it
does.'

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  * If you depend on the old behavior of volumes binding to existing pool of PersistentVolume objects then modify the StorageClass object and set `storageclass.beta.kubernetes.io/is-default-class` to `false`.