When an Indexed Job has a number of completions higher than 10^5 and parallelism higher than 10^4, and a big number of Indexes fail, Kubernetes might not be able to track the termination of the Job. Kubernetes now emits a warning, at Job creation, when the Job manifest exceeds both of these limits. ([#118420](https://github.com/kubernetes/kubernetes/pull/118420), [@alculquicondor](https://github.com/alculquicondor)) [SIG Apps]

## Changes by Kind

### Deprecation

- Added a [warning](https://k8s.io/blog/2020/09/03/warnings/) response when handling requests that set the deprecated `spec.externalID` field for a Node. ([#115944](https://github.com/kubernetes/kubernetes/pull/115944), [@SataQiu](https://github.com/SataQiu)) [SIG Node]
- Added warnings to the Services API. Kubernetes now warns for Services in the case of:

  Don't use these flags. Using deprecated flags causes the server to print a warning. Using a removed flag causes the server to abort the startup.

* The following deprecated flags were removed from `kubelet`:

  * `api-servers` - add apiserver addresses to the kubeconfig file instead.

  Don't use these flags. Using deprecated flags causes the kubelet to print a warning. Using a removed flag causes the kubelet to abort the startup.

### Other (Cleanup or Flake)

- Add warning for PV on relaim policy when it is Recycle ([#122339](https://github.com/kubernetes/kubernetes/pull/122339), [@carlory](https://github.com/carlory)) [SIG Storage]

- `kubeadm`: updated warning message when swap space is detected. When swap is
  active on Linux, `kubeadm` explains that swap is supported for cgroup v2 only and

- Kubectl apply: warning that kubectl will ignore no-namespaced resource `pv & namespace` in a future release if the namespace is specified and allowlist is not specified. ([#110907](https://github.com/kubernetes/kubernetes/pull/110907), [@pacoxu](https://github.com/pacoxu))...