In 1.12, SIG Cluster lifecycle has focused on improving the user experience in kubeadm, by fixing a number of bugs and adding some new important features.

Here is a list of some of the changes that have been made to kubeadm:

- Kubeadm internal config has been promoted to `v1alpha3`:
  - `v1alpha1` has been removed.

  - `timeout` default changed from `30s` to `10s` for v1
  - `sideEffects` default value is removed, and the field made required, and only `None` and `NoneOnDryRun` are permitted for v1
  - `admissionReviewVersions` default value is removed and the field made required for v1 (supported versions for AdmissionReview are `v1` and `v1beta1`)

  // resource by mistake. Scheduling and pod startup are then blocked
  // until the unrelated ResourceClaim is removed.
  //
  // This field is immutable and no changes will be made to the
  // corresponding ResourceClaim by the control plane after creating the
  // ResourceClaim.
  optional string resourceClaimTemplateName = 2;
}

As far as platforms, working with SIG-Windows, enhancements were made to the kubelet to improve platform support on Windows operating systems, and improvements to resource management were also made.  In particular, support for sysctls on Linux graduated to beta.

### SIG OpenStack

iv) states that source code for the Program is available from such Contributor, and informs licensees how to obtain it in a reasonable manner on or through a medium customarily used for software exchange. When the Program is made available in source code form: a) it must be made available under this Agreement; and b) a copy of this Agreement must be included with each copy of the Program. Contributors may not remove or alter any copyright notices contained within the Program. Each Contributor must...

For the 1.13 release, SIG API Machinery is happy to announce that the [dry-run functionality](https://kubernetes.io/docs/reference/using-api/api-concepts/#dry-run) is now beta.

### SIG Auth

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.

[SIG Scheduling]: https://github.com/kubernetes/community/tree/master/sig-scheduling

### SIG Storage

### OpenStack

- Made `apiextensions-apiserver` binary linking static (also affects the deb and rpm packages). ([#114226](https://github.com/kubernetes/kubernetes/pull/114226), [@saschagrunert](https://github.com/saschagrunert))

built-in function <a href="#Length_and_capacity"><code>cap(a)</code></a>.
</p>

<p>
A new, initialized slice value for a given element type <code>T</code> may be
made using the built-in function
<a href="#Making_slices_maps_and_channels"><code>make</code></a>,
which takes a slice type
and parameters specifying the length and optionally the capacity.