in cloudprober/grpc_gpc_prober/firestore_probes.php [15:27]
function document($client, &$metrics){
global $_PARENT_RESOURCE;
$list_document_request = new Google\Cloud\Firestore\V1beta1\ListDocumentsRequest();
$list_document_request->setParent($_PARENT_RESOURCE);
$time_start = microtime_float();
$client->ListDocuments($list_document_request);
$lantency = (microtime_float()- $time_start) * 1000;
$metrics['list_documents_latency_ms'] = $lantency;
}