## Before Upgrading

Consider the following changes, limitations, and guidelines before you upgrade:

### **API Machinery**

- Featuregate AllowInsecureBackendProxy graduates to GA and unconditionally enabled. ([#99658](https://github.com/kubernetes/kubernetes/pull/99658), [@deads2k](https://github.com/deads2k))
- Increase timeout for pod lifecycle test to reach pod status=ready ([#96691](https://github.com/kubernetes/kubernetes/pull/96691), [@hh](https://github.com/hh))

`important` is a category. ([#59561](https://github.com/kubernetes/kubernetes/pull/59561), [@nikhita](https://github.com/nikhita))

* Fixed an issue making it possible to create a situation in which two webhooks make it impossible to delete each other. ValidatingWebhooks and MutatingWebhooks will not be called on admission requests for ValidatingWebhookConfiguration and MutatingWebhookConfiguration objects in the admissionregistration.k8s.io group ([#59840](https://github.com/kubernetes/k...

- Number of errors reported to the metric `storage_operation_duration_seconds_count` for emptyDir decreased significantly because previously one error was reported for each projected volume created. ([#117022](https://github.com/kubernetes/kubernetes/pull/117022), [@mpatlasov](https://github.com/mpatlasov)) [SIG Storage]

  When the scheduling queue receives a cluster event, before moving each Pod from unschedulable pod pool to activeQ/backoffQ, it will call QueueingHintFn of plugins that rejected each Pod in the previous scheduling cycle.

    - [Server Binaries](#server-binaries-17)
    - [Node Binaries](#node-binaries-17)
- [Changes](#changes)
  - [What’s New (Major Themes)](#whats-new-major-themes)
    - [Cloud Provider Labels reach General Availability](#cloud-provider-labels-reach-general-availability)
    - [Volume Snapshot Moves to Beta](#volume-snapshot-moves-to-beta)
    - [CSI Migration Beta](#csi-migration-beta)
  - [Known Issues](#known-issues)

For the 1.8 release, SIG Scheduling extended the concept of cluster sharing by introducing
pod priority and pod preemption. These features allow mixing various types of workloads in a single cluster, and help reach
higher levels of resource utilization and availability.
These features are in alpha. SIG Scheduling also improved the internal APIs for scheduling and made them easier for other components and external schedulers to use.

- Reporting E2E conformance test results to TestGrid from every cloud provider (in collaboration with SIG Testing & SIG Release)
- Defining minimum required documentation from each cloud provider which includes (in collaboration with SIG Docs):
  - example manifests for the kube-apiserver, kube-controller-manager, kube-schedule, kubelet, and the cloud-controller-manager

### Serverside Apply - Beta 2

* `kubectl wait` is a new command that allows waiting for one or more resources to be deleted or to reach a specific condition. It adds a `kubectl wait --for=[delete|condition=condition-name] resource/string` command. ([#64034](https://github.com/kubernetes/kubernetes/pull/64034), [@deads2k](https://github.com/deads2k))