* [prometheus-to-sd addon] Bump prometheus-to-sd to 0.3.1 to pick up security fixes, bug fixes and new features.
    * [event-exporter addon] Bump event-exporter to 0.2.3 to pick up security fixes.
* Fix validation for HealthzBindAddress in kube-proxy when --healthz-port is set to 0 ([#66138](https://github.com/kubernetes/kubernetes/pull/66138), [@wsong](https://github.com/wsong))

- Kubelet now exports a `server_expiration_renew_failure` and `client_expiration_renew_failure` metric counter if the certificate rotations cannot be performed. ([#84614](https://github.com/kubernetes/kubernetes/pull/84614), [@rphillips](https://github.com/rphillips))...

    * [prometheus-to-sd addon] Bump prometheus-to-sd to 0.3.1 to pick up security fixes, bug fixes and new features.
    * [event-exporter addon] Bump event-exporter to 0.2.3 to pick up security fixes.

- Export `NewDebuggingRoundTripper` function and `DebugLevel` options in the k8s.io/client-go/transport package. ([#98324](https://github.com/kubernetes/kubernetes/pull/98324), [@atosatto](https://github.com/atosatto))

- Enable external plugins can be used as subcommands for kubectl create command if subcommand does not exist as builtin only when KUBECTL_ENABLE_CMD_SHADOW environment variable is exported. ([#116293](https://github.com/kubernetes/kubernetes/pull/116293), [@ardaguclu](https://github.com/ardaguclu))

### Action Required

* New GCE or GKE clusters created with `cluster/kube-up.sh` will not enable the legacy ABAC authorizer by default. If you would like to enable the legacy ABAC authorizer, export ENABLE_LEGACY_ABAC=true before running `cluster/kube-up.sh`. ([#51367](https://github.com/kubernetes/kubernetes/pull/51367), [@cjcullen](https://github.com/cjcullen))

### Other notable changes

- Kube-apiserver backed by etcd3 exports metric showing the database file size. ([#89151](https://github.com/kubernetes/kubernetes/pull/89151), [@jingyih](https://github.com/jingyih)) [SIG API Machinery]

- go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp: v0.20.0
- go.opentelemetry.io/contrib: v0.20.0
- go.opentelemetry.io/otel/exporters/otlp: v0.20.0
- go.opentelemetry.io/otel/metric: v0.20.0
- go.opentelemetry.io/otel/oteltest: v0.20.0
- go.opentelemetry.io/otel/sdk/export/metric: v0.20.0
- go.opentelemetry.io/otel/sdk/metric: v0.20.0
- go.opentelemetry.io/otel/sdk: v0.20.0
- go.opentelemetry.io/otel/trace: v0.20.0

## Deprecations and Removals

- kubectl
  - `kubectl convert`, deprecated since v1.14, will be removed in v1.17.
  - The `--export` flag for the `kubectl get` command, deprecated since v1.14, will be removed in v1.18.
  - The `--pod`/`-p` flag for `kubectl exec`, deprecated since 1.12, has been removed.

([#69099](https://github.com/kubernetes/kubernetes/pull/69099), [@ehashman](https://github.com/ehashman))

## Deprecations

- kubectl
  - `kubectl convert` is deprecated and will be removed in v1.17.
  - The `--export` flag for the `kubectl get` command is deprecated and will be removed in v1.18. ([#73787](https://github.com/kubernetes/kubernetes/pull/73787), [@soltysh](https://github.com/soltysh))

- kubelet