Pydantic verhält sich speziell, wenn Sie `Optional` oder `Union[Etwas, None]` ohne einen Default-Wert verwenden. Sie können darüber in der Pydantic Dokumentation unter <a href="https://docs.pydantic.dev/2.3/usage/models/#required-fields" class="external-link" target="_blank">Required fields</a> mehr erfahren.

///

## Typhinweise mit Metadaten-Annotationen

    }

    @BeforeEach
    void setUp() throws Exception {
        // Common, safe defaults for collaborators
        when(mockHandle.isValid()).thenReturn(true);
        when(mockHandle.acquire()).thenReturn(mockHandle);
        when(mockHandle.getTree()).thenReturn(mockTree);
        when(mockHandle.getFileId()).thenReturn(new byte[16]);

        when(mockTree.getReceiveBufferSize()).thenReturn(0x10000);

- kubeadm: removed preflight check for `ip`, `iptables`, `ethtool` and `tc` on Linux nodes. 
kubelet and kube-proxy will continue to report `iptables` errors if its usage is required. The tools `ip`, `ethtool` and `tc` had legacy usage in the kubelet but are no longer required. ([#129131](https://github.com/kubernetes/kubernetes/pull/129131), [@pacoxu](https://github.com/pacoxu)) [SIG Cluster Lifecycle]

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