## Known Issues

- Concurrently joining control-plane nodes does not work as expected in kubeadm 1.15.0. The feature was planned for release in 1.15.0, but a fix may  come in a follow up patch release.

  * Caveat: The alpha version no longer supports, and...

Cluster Lifecycle

SIG Cluster Lifecycle has been focusing on improving kubeadm in order to bring it to GA in a future release, as well as developing the [Cluster API](https://github.com/kubernetes/kube-deploy/tree/master/cluster-api). For kubeadm, most new features, such as support for CoreDNS, IPv6 and Dynamic Kubelet Configuration, have gone in as alpha features. We expect to graduate these features to beta and beyond in the next release. The initial Cluster API spec and GCE sample implementation...

### CSI Health Monitoring

The CSI health monitoring feature is being released as a second Alpha in Kubernetes 1.21. This feature enables CSI Drivers to share abnormal volume conditions from the underlying storage systems with Kubernetes so that they can be reported as events on PVCs or Pods. This feature serves as a stepping stone towards programmatic detection and resolution of individual volume health issues by Kubernetes.

* Requests with the query parameter `?watch=` are treated by the API server as a request to watch, but authorization and metrics were not correctly identifying those as watch requests, instead grouping them as list calls. ([#48583](https://github.com/kubernetes/kubernetes/pull/48583), [@smarterclayton](https://github.com/smarterclayton))

// 2. Add appropriate interior and exterior padding for step 3 (see example
//    below).
// 3. Convolve the result of step 2. with a kernel consisting of 1's (same shape
//    as windows) and stride 1 in each dimension. This is implemented as a
//    `ReduceWindowOp` with `AddOp` as body.
//
// Example:
// Let f : R^4 -> R^2 be an average pool function with window size 3, stride 2,
// and SAME padding with 0's. It is defined by

### Other notable changes

// makes that struct also non-comparable, and generally doesn't add
// any size (as long as it's first).
type http2incomparable [0]func()

// synctestGroupInterface is the methods of synctestGroup used by Server and Transport.
// It's defined as an interface here to let us keep synctestGroup entirely test-only
// and not a part of non-test builds.

- Fixes a 1.30.0 regression in openapi descriptions of imagePullSecrets and hostAliases fields to mark the fields used as keys in those lists as either defaulted or required. ([#124694](https://github.com/kubernetes/kubernetes/pull/124694),...

      endpoint now gets broken when that endpoint becomes non-ready
      (rather than continuing until the endpoint is fully deleted).
  
    - Traffic to a service IP now starts getting rejected (as opposed to
      merely dropped) as soon as there are no longer any *usable*
      endpoints, rather than waiting until all of the terminating
      endpoints have terminated even when those terminating endpoints
      were not being used.