For floating-point arguments negative zero, NaN, and infinity the following rules apply:
</p>

<pre>
   x        y    min(x, y)    max(x, y)

  -0.0    0.0         -0.0          0.0    // negative zero is smaller than (non-negative) zero
  -Inf      y         -Inf            y    // negative infinity is smaller than any other number
  +Inf      y            y         +Inf    // positive infinity is larger than any other number

  // +optional
  optional bool readOnly = 4;
}

// Affinity is a group of affinity scheduling rules.
message Affinity {
  // Describes node affinity scheduling rules for the pod.
  // +optional
  optional NodeAffinity nodeAffinity = 1;

  // Describes pod affinity scheduling rules (e.g. co-locate this pod in the same node, zone, etc. as some other pod(s)).
  // +optional

- **[beta]** [Node affinity/anti-affinity](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/) and **[beta]** [pod affinity/anti-affinity](https://kubernetes.io/docs/concepts/configuration/assign-pod-node/). Node affinity/anti-affinity allow you to specify rules for restricting which node(s) a pod can schedule onto, based on the labels on the node. Pod affinity/anti-affinity allow you to specify rules for spreading and packing pods relative...

* Fix inter-pod anti-affinity check to consider a pod a match when all the anti-affinity terms match. ([#62715](https://github.com/kubernetes/kubernetes/pull/62715), [@bsalamat](https://github.com/bsalamat))

### SIG-scheduling

SIG Scheduling development efforts have been primarily focused on improving performance and reliability of the scheduler.
- Performance of the inter-pod affinity/anti-affinity feature is improved over 100X via algorithmic optimization.

* Cloud Controller Manager now sets Node.Spec.ProviderID ([#50730](https://github.com/kubernetes/kubernetes/pull/50730), [@andrewsykim](https://github.com/andrewsykim))
* Parameterize session affinity timeout seconds in service API for Client IP based session affinity. ([#49850](https://github.com/kubernetes/kubernetes/pull/49850), [@m1093782566](https://github.com/m1093782566))

using `AffinityInAnnotations=true` in `--feature-gates`, then the 1.7 release is your last opportunity to convert from specifying affinity/anti-affinity using the scheduler.alpha.kubernetes.io/affinity annotation on Pods, to using the Affinity field of PodSpec. Support for the alpha version of node and pod affinity (which uses the scheduler.alpha.kubernetes.io/affinity annotations on Pods) is going away **in Kubernetes 1.8** (not this release, but the next release). If you have not enabled Affini...

- Fixed 'kubeadm upgrade' infinite loop waiting for pod restart ([#69886](https://github.com/kubernetes/kubernetes/pull/69886), [@bart0sh](https://github.com/bart0sh))

- The calculations for Pod topology spread skew now exclude nodes that
  don't match the node affinity/selector. This may lead to unschedulable pods if you previously had pods
  matching the spreading selector on those excluded nodes (not matching the node affinity/selector),
  especially when the `topologyKey` is not node-level. Revisit the node affinity and/or pod selector in the

* Cloud Controller Manager now sets Node.Spec.ProviderID ([#50730](https://github.com/kubernetes/kubernetes/pull/50730), [@andrewsykim](https://github.com/andrewsykim))
* Parameterize session affinity timeout seconds in service API for Client IP based session affinity. ([#49850](https://github.com/kubernetes/kubernetes/pull/49850), [@m1093782566](https://github.com/m1093782566))