*   `etcd2` as a backend is deprecated and support will be removed in Kubernetes 1.13 or 1.14.

### **Auth**

* Format-separated endpoints for the OpenAPI spec, such as /swagger.json, /swagger-2.0.0.0.json, and so on, have been deprecated. The old endpoints will remain in 1.10, 1.11, 1.12 and 1.13, and get removed in 1.14. Please use single `/openapi/v2` endpoint with the appropriate Accept: header instead. For example:

<table>
  <tr>
    <td>previous</td>
    <td>now</td>
  </tr>
  <tr>

### SIG Azure

For 1.13 SIG Azure was focused on adding additional Azure Disk support for Ultra SSD, Standard SSD, and Premium Azure Files. Azure Availability Zones and cross resource group nodes were also moved from Alpha to Beta in 1.13.

### SIG Big Data

* Disabled ScheduleDaemonSetPods if kubelet version less than 1.11; and ScheduleDaemonSetPods is not supported on a 1.13 control plane / 1.10 kubelet split. ([#69566](https://github.com/kubernetes/kubernetes/pull/69566), [@k82cn](https://github.com/k82cn))

  The API Server will no longer proxy non-101 responses for upgrade requests. This could break proxied backends (such as an extension API server) that respond to upgrade requests with a non-101 response code. ([#92941](https://github.com/kubernetes/kubernetes/pull/92941), [@tallclair](https://github.com/tallclair)) [SIG API Machinery]
 

  The API Server will no longer proxy non-101 responses for upgrade requests. This could break proxied backends (such as an extension API server) that respond to upgrade requests with a non-101 response code. ([#92941](https://github.com/kubernetes/kubernetes/pull/92941), [@tallclair](https://github.com/tallclair)) [SIG API Machinery]
 
## Changes by Kind

- Kube-apiserver: `--audit-log-version` and `--audit-webhook-version` now only support the default value of `audit.k8s.io/v1`. The v1alpha1 and v1beta1 audit log versions, deprecated since 1.13, have been removed. ([#108092](https://github.com/kubernetes/kubernetes/pull/108092), [@carlory](https://github.com/carlory))

- [fluentd-gcp addon] Bump fluentd-gcp-scaler to v0.5.2 to pick up security fixes. ([#76762](https://github.com/kubernetes/kubernetes/pull/76762), [@serathius](https://github.com/serathius))
- The GCERegionalPersistentDisk feature gate (GA in 1.13) can no longer be disabled. The feature gate will be removed in v1.17. ([#77412](https://github.com/kubernetes/kubernetes/pull/77412), [@liggitt](https://github.com/liggitt))

- fluentd-gcp is unchanged at v3.2.0 since Kubernetes 1.13 ([#70954](https://github.com/kubernetes/kubernetes/pull/70954))
- OIDC authentication is unchanged at coreos/go-oidc v2 since Kubernetes 1.10 ([#58544](https://github.com/kubernetes/kubernetes/pull/58544))
- Calico is unchanged at v3.3.1 since Kubernetes 1.13 ([#70932](https://github.com/kubernetes/kubernetes/pull/70932))