def METHOD_NAME(extension_name: Optional[pulumi.Input[str]] = None,
                                 machine_name: Optional[pulumi.Input[str]] = None,
                                 resource_group_name: Optional[pulumi.Input[str]] = None,
                                 opts: Optional[pulumi.InvokeOptions] = None) -> pulumi.Output[GetMachineExtensionResult]:
    """
    The operation to get the extension.
    :param str extension_name: The name of the machine extension.
    :param str machine_name: The name of the machine containing the extension.
    :param str resource_group_name: The name of the resource group. The name is case insensitive.
    """
    ...