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