private static function getPageStreamingDescriptors()
{
$listLogMetricsPageStreamingDescriptor = new PageStreamingDescriptor(['requestPageTokenField' => 'page_token', 'requestPageSizeField' => 'page_size', 'responsePageTokenField' => 'next_page_token', 'resourceField' => 'metrics']);
$pageStreamingDescriptors = ['listLogMetrics' => $listLogMetricsPageStreamingDescriptor];
return $pageStreamingDescriptors;
}