- A new metric `lifecycle_handler_sleep_terminated_total` is added to record how many times LifecycleHandler sleep got unexpectedly terminated. ([#122456](https://github.com/kubernetes/kubernetes/pull/122456), [@AxeZhan](https://github.com/AxeZhan))

- Added `apiserver.latency.k8s.io/authentication` annotation to the audit log to record the
  time spent authenticating slow requests. Also added `apiserver.latency.k8s.io/authorization`
  annotation to record the time spent authorizing slow requests. ([#130571](https://github.com/kubernetes/kubernetes/pull/130571), [@hakuna-matatah](https://github.com/hakuna-matatah))

- In a scheduler with `Permit` plugins, when a Pod is rejected during `WaitOnPermit`, the scheduler records the plugin.

- Deprecate `--record` flag in `kubectl`. The `--record` flag is being replaced with the [mechanism](https://github.com/kubernetes/enhancements/tree/master/keps/sig-cli/859-kubectl-headers) which annotates HTTP requests with kubectl command details. ([#102873](https://github.com/kuber...

- Client-go: add new histogram metric to record the size of the requests and responses. ([#108296](https://github.com/kubernetes/kubernetes/pull/108296), [@aojea](https://github.com/aojea))

    assert not override4 or "x-level4" in response.headers
    assert not override5 or "x-level5" in response.headers


def test_openapi():
    client = TestClient(app)
    with warnings.catch_warnings(record=True) as w:
        warnings.simplefilter("always")
        response = client.get("/openapi.json")
        assert issubclass(w[-1].category, UserWarning)
        assert "Duplicate Operation ID" in str(w[-1].message)

    * - Fix for kube-dns returns NXDOMAIN when not yet synced with apiserver.
    * - Don't generate empty record for externalName service.
    * - Add validation for upstreamNameserver port.
    * - Update go version to 1.9.3.

- `process_start_time_seconds` has been added to kubelet’s '/metrics/probes' endpoint ([#77975](https://github.com/kubernetes/kubernetes/pull/77975), [@logicalhan](https://github.com/logicalhan))
- Scheduler: added metrics to record the number of pending pods in different queues ([#75501](https://github.com/kubernetes/kubernetes/pull/75501), [@Huang-Wei](https://github.com/Huang-Wei))

- Added apiserver.latency.k8s.io/apf-queue-wait annotation to the audit log
  to record the time spent waiting in APF queue. ([#123919](https://github.com/kubernetes/kubernetes/pull/123919), [@hakuna-matatah](https://github.com/hakuna-matatah))

    * - Fix for kube-dns returns NXDOMAIN when not yet synced with apiserver.
    * - Don't generate empty record for externalName service.
    * - Add validation for upstreamNameserver port.
    * - Update go version to 1.9.3.