req.Header.Set("X-Amz-Copy-Source", testCase.copySourceHeader)
		}
		if testCase.copySourceRange != "" {
			if testCase.copySourceRange == "empty" {
				req.Header.Set("X-Amz-Copy-Source-Range", "") // specifically test for S3 errors in this scenario.
			} else {
				req.Header.Set("X-Amz-Copy-Source-Range", testCase.copySourceRange)
			}
		}

  - removed the ability to set `kubernetes.io`- or `k8s.io`-prefixed labels via `--node-labels`, other than the [specifically allowed labels/prefixes](https://github.com/kubernetes/enhancements/blob/master/keps/sig-auth/279-limit-node-access/README.md#proposal). ([#79305](https://github.com/kubernetes/kubernetes/pull/79305), [@paivagustavo](https://github.com/paivagustavo))...

bernetes/kubernetes/pull/57926), [@wwwtyro](https://github.com/wwwtyro))

* Check for known manifests during preflight instead of only checking for non-empty manifests directory. This makes the preflight checks less heavy-handed by specifically checking for well-known files (kube-apiserver.yaml, kube-controller-manager.yaml, kube-scheduler.yaml, etcd.yaml) in /etc/kubernetes/manifests instead of simply checking for a non-empty directory. ([#57287](https://github.com/kubernetes/kubernetes/pull/57287),...

### SIG Service Catalog

The Service Plan Defaults feature is still under active development.
We continue to improve the UX for the svcat CLI, specifically filling in gaps for the new Namespaced Service Broker feature.

### SIG Storage

  - bazel: output go_binary rule directly from go_binary_conditional_pure
    
    From: [@mikedanese](https://github.com/mikedanese):
    Instead of aliasing. Aliases are annoying in a number of ways. This is
    specifically bugging me now because they make the action graph harder to
    analyze programmatically. By using aliases here, we would need to handle
    potentially aliased go_binary targets and dereference to the effective
    target.

JSON API clients should tolerate `null` values for such fields, and treat `null` and `[]` as equivalent in meaning unless specifically documented otherwise for a particular field. ([#44593](https://github.com/kubernetes/kubernetes/pull/44593))

users to use the familiar `kubeadm init` and `kubeadm join` commands to [configure and deploy an HA control plane](https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/). An entire new test suite has been created specifically for ensuring these features will stay stable over time.

Certificate management has become more robust in 1.15, with kubeadm now seamlessly rotating all your certificates (on upgrades) before they expire. Check the [kubeadm documen...

    *  - Created new GCE_SSH_KEY allowing specification of SSH keys for gce, gke, and kubemark.
    *  - AWS_SSH_KEY, previously assumed to be an absolute path can now be either relative or absolute

The merged fix enforces validation against the proxying address for a Node. In some cases, the fix can break clients that depend on the `nodes/proxy` subresource, specifically if a kubelet advertises a localhost or link-local address to the Kubernetes control plane. Configuring an egress proxy for egress to the cluster network can also mitigate this vulnerability.

**Affected Versions**:

* The `kubeadm config images pull` command can now be used to pull container images used by kubeadm....