def METHOD_NAME(diagnostic_settings_name: Optional[str] = None,
                                  resource_group_name: Optional[str] = None,
                                  opts: Optional[pulumi.InvokeOptions] = None) -> AwaitableGetGuestDiagnosticsSettingResult:
    """
    Gets guest diagnostics settings.
    Azure REST API version: 2018-06-01-preview.
    :param str diagnostic_settings_name: The name of the diagnostic setting.
    :param str resource_group_name: The name of the resource group. The name is case insensitive.
    """
    __args__ = dict()
    __args__['diagnosticSettingsName'] = diagnostic_settings_name
    __args__['resourceGroupName'] = resource_group_name
    opts = pulumi.InvokeOptions.merge(_utilities.get_invoke_opts_defaults(), opts)
    __ret__ = pulumi.runtime.invoke('azure-native:insights:getGuestDiagnosticsSetting', __args__, opts=opts, typ=GetGuestDiagnosticsSettingResult).value
    return AwaitableGetGuestDiagnosticsSettingResult(
        data_sources=pulumi.get(__ret__, 'data_sources'),
        id=pulumi.get(__ret__, 'id'),
        location=pulumi.get(__ret__, 'location'),
        name=pulumi.get(__ret__, 'name'),
        os_type=pulumi.get(__ret__, 'os_type'),
        proxy_setting=pulumi.get(__ret__, 'proxy_setting'),
        tags=pulumi.get(__ret__, 'tags'),
        type=pulumi.get(__ret__, 'type'))