<pre>
type (
	nodeList = []*Node  // nodeList and []*Node are identical types
	Polar    = polar    // Polar and polar denote identical types
)
</pre>


<h4 id="Type_definitions">Type definitions</h4>

<p>
A type definition creates a new, distinct type with the same
<a href="#Underlying_types">underlying type</a> and operations as the given type
and binds an identifier, the <i>type name</i>, to it.
</p>

  * You can find the PodSpec tolerations that were created as annotations (if any) in a controller definition by doing `kubectl get <controller kind> <controller name> -o yaml` and looking for the "Annotation" section with the annotation key `scheduler.alpha.kubernetes.io/tolerations` (This will work whether you are running Kubernetes 1.5 or 1.6).

 - Fixes a bug defining a default value for a replicas field in a custom resource definition that has the scale subresource enabled ([#90022](https://github.com/kubernetes/kubernetes/pull/90022), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, CLI, Cloud Provider and Cluster Lifecycle]

- Ubuntu 18.04 (Bionic) series has been added to Juju charms ([#65644](https://github.com/kubernetes/kubernetes/pull/65644), [@tvansteenburgh](https://github.com/tvansteenburgh))

- Fixed nil pointer error in `NodeVolumeLimits` csi logging ([#115179](https://github.com/kubernetes/kubernetes/pull/115179), [@sunnylovestiramisu](https://github.com/sunnylovestiramisu))
- Fixed panic validating custom resource definition schemas that set `multipleOf` to 0 ([#114869](https://github.com/kubernetes/kubernetes/pull/114869), [@liggitt](https://github.com/liggitt))

SIG Scalability has mostly focused on stability and deflaking our tests, investing into framework for writing scalability tests (ClusterLoader v2) with a goal to migrate all tests to it by the end of 2018 and on the work towards extending definition of Kubernetes scalability by providing more/better user-friendly SLIs/SLOs.

### SIG Scheduling

#### **Custom Resources**

*   Validation of resources defined by a Custom Resource Definition (CRD) is now in beta ([#54647](https://github.com/kubernetes/kubernetes/pull/54647),[ @colemickens](https://github.com/colemickens))

  // to run this pod.  If no RuntimeClass resource matches the named class, the pod will not be run.
  // If unset or empty, the "legacy" RuntimeClass will be used, which is an implicit class with an
  // empty definition that uses the default runtime handler.
  // More info: https://git.k8s.io/enhancements/keps/sig-node/585-runtime-class
  // +optional
  optional string runtimeClassName = 29;

- A `system-cluster-critical` pod should not get a low OOM Score. 
  

 - Fixes a bug defining a default value for a replicas field in a custom resource definition that has the scale subresource enabled ([#90020](https://github.com/kubernetes/kubernetes/pull/90020), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, CLI, Cloud Provider, Cluster Lifecycle and Instrumentation]