}

func doprint() {
	once.Do(setup)
	print(a)
}

func twoprint() {
	go doprint()
	go doprint()
}
</pre>

<p>
calling <code>twoprint</code> will call <code>setup</code> exactly
once.
The <code>setup</code> function will complete before either call
of <code>print</code>.
The result will be that <code>"hello, world"</code> will be printed
twice.
</p>

- If a bad flag is supplied to a kubectl command, only a tip to run `--help` is printed, instead of the usage menu.  Usage menu is printed upon running `kubectl command --help`. ([#82423](https://github.com/kubernetes/kubernetes/pull/82423), [@sallyom](https://github.com/sallyom))

        }

        @ParameterizedTest
        @DisplayName("Should format different oplock levels correctly")
        @CsvSource({ "0, 0", "1, 1", "2, 2", "8, 8", "255, -1" // byte 255 is -1 when printed as signed
        })
        void testToStringWithDifferentOplockLevels(int inputValue, String expectedDisplay) throws Exception {
            byte oplockLevel = (byte) inputValue;

  - The DynamicKubeletConfig feature gate is deprecated. The functionality is still accessible by using the kubeadm alpha kubelet enable-dynamic command.
  - The command `kubeadm config print-defaults` is deprecated in favor of `kubeadm config print init-defaults` and `kubeadm config print join-defaults` ([#69617](https://github.com/kubernetes/kubernetes/pull/69617), [@rosti](https://github.com/rosti))

- kubectl now loads config file once and uses persistent client config ([#71117](https://github.com/kubernetes/kubernetes/pull/71117), [@dixudx](https://github.com/dixudx))
- Printed `SizeLimit` of `EmptyDir` in `kubectl describe pod` outputs. ([#69279](https://github.com/kubernetes/kubernetes/pull/69279), [@dtaniwaki](https://github.com/dtaniwaki))

* Allow missing keys in templates by default ([#39486](https://github.com/kubernetes/kubernetes/pull/39486), [@ncdc](https://github.com/ncdc))
* Fix kubectl get -f <file> -o <nondefault printer> so it prints all items in the file ([#39038](https://github.com/kubernetes/kubernetes/pull/39038), [@ncdc](https://github.com/ncdc))

* Added liveness probe to Heapster service. ([#31878](https://github.com/kubernetes/kubernetes/pull/31878), [@mksalawa](https://github.com/mksalawa))
* Adding clusters to the list of valid resources printed by kubectl help ([#31719](https://github.com/kubernetes/kubernetes/pull/31719), [@nikhiljindal](https://github.com/nikhiljindal))

- Fixed kubelet logging to properly respect verbosity levels. Previously, some debug/info messages using V().Error() would always be printed regardless of the configured log verbosity. ([#136432](https://github.com/kubernetes/kubernetes/pull/136432), [@thc1006](https://github.com/thc1006)) [SIG Node]

- Fixed kubelet logging to properly respect verbosity levels. Previously, some debug/info messages using V().Error() would always be printed regardless of the configured log verbosity. ([#136028](https://github.com/kubernetes/kubernetes/pull/136028), [@thc1006](https://github.com/thc1006)) [SIG Node]

- Replaced deprecated package `k8s.io/utils/pointer` with `k8s.io/utils/ptr` for the apiextensions-apiserver apiextensions. ([#132723](https://github.com/kubernetes/kubernetes/pull/132723), [@PatrickLaabs](https://github.com/PatrickLaabs))