* The kubeadm configuration file version has been upgraded from `v1alpha1` to `v1alpha2`. `v1alpha1` read support exists in v1.11, but will be removed in v1.12. ([#63788](https://github.com/kubernetes/kubernetes/pull/63788), [@luxas](https://github.com/luxas))
The following PRs changed the API spec:

* Rename some flags for beta UI and fixup some logic ([#42064](https://github.com/kubernetes/kubernetes/pull/42064), [@luxas](https://github.com/luxas))
* Insecure access to the API Server at localhost:8080 will be turned off in v1.6 when using kubeadm ([#42066](https://github.com/kubernetes/kubernetes/pull/42066), [@luxas](https://github.com/luxas))

* [alpha] An experimental self-hosted cluster can now easily be created with `kubeadm init`. Enable the feature by setting the SelfHosting feature gate to true: `--feature-gates=SelfHosting=true` ([#296](https://github.com/kubernetes/enhancements/issues/296), [@luxas](https://github.com/luxas))

* kubeadm deb/rpm packages: cAdvisor doesn't listen on `0.0.0.0:4194` without authentication/authorization because of the possible information leakage. The cAdvisor API can still be accessed via `https://{node-ip}:10250/stats/`, though. ([kubernetes/release#356](https://github.com/kubernetes/release/pull/356), [@luxas](https://github.com/luxas))


### Cloud Providers

- The `MasterConfiguration` kind in the kubeadm v1alpha2 API has been renamed `InitConfiguration` in v1alpha3 ([#65945](https://github.com/kubernetes/kubernetes/pull/65945), [@luxas](https://github.com/luxas)) Courtesy of SIG Cluster Lifecycle

* kubeadm: Enable kubelet client certificate rotation ([#52196](https://github.com/kubernetes/kubernetes/pull/52196), [@luxas](https://github.com/luxas))
* Scheduler predicate developer should respect equivalence class cache ([#52146](https://github.com/kubernetes/kubernetes/pull/52146), [@resouer](https://github.com/resouer))

- kubeadm now supports the `--image-repository` flag for customizing what registry to pull images from ([#71135](https://github.com/kubernetes/kubernetes/pull/71135), [@luxas](https://github.com/luxas))

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