- Graduated seccomp profile defaulting to GA.
  
  Set the kubelet `--seccomp-default` flag or `seccompDefault` kubelet configuration field to `true` to make pods on that node default to using the `RuntimeDefault` seccomp profile.
  

* Start synchronizing pods after network is ready.  ([#68752](https://github.com/kubernetes/kubernetes/pull/68752), [@krzysztof-jastrzebski](https://github.com/krzysztof-jastrzebski))
* kubectl has gained new --profile and --profile-output options to output go profiles ([#68681](https://github.com/kubernetes/kubernetes/pull/68681), [@dlespiau](https://github.com/dlespiau))

The cri-tools project, which aims to provide consistent tooling for operators to debug and introspect their nodes in production independent of their chosen container runtime, graduated to GA.

## Major themes

Kubernetes is developed by community members whose work is organized into
[Special Interest Groups](https://github.com/kubernetes/community/blob/master/sig-list.md), which provide the themes that guide their work. For the 1.9 release, these themes included:

### API Machinery

- Promote CronJobs to batch/v1 ([#99423](https://github.com/kubernetes/kubernetes/pull/99423), [@soltysh](https://github.com/soltysh)) [SIG API Machinery, Apps, CLI and Testing]

79), [@ijc](https://github.com/ijc))

* kubeadm: New "imagePullPolicy" option in the init configuration file, that gets forwarded to kubelet static pods to control pull policy for etcd and control plane images. This option allows for precise image pull policy specification for master nodes and thus for more tight control over images. It is useful in CI environments and in environments, where the user has total control over master VM templates (thus, the master VM templates can be preloaded...

[SIG Apps]: https://github.com/kubernetes/community/tree/master/sig-apps

- Promote NodeLease feature to GA.

  - Kube-scheduler can run more than one scheduling profile. Given a pod, the profile is selected by using its `.spec.schedulerName`. ([#88285](https://github.com/kubernetes/kubernetes/pull/88285), [@alculquicondor](https://github.com/alculquicondor)) [SIG Apps, Scheduling and Testing]

- Added new config option `delayCacheUntilActive` to `KubeSchedulerConfiguration` that can provide a tradeoff between memory efficiency and scheduling speed when their leadership is updated in `kube-scheduler` ([#115754](https://github.com/kubernetes/kubernetes/pull/115754), [@linxiulei](https://github.com/linxiulei)) [SIG API Machinery and Scheduling]...