Run report setting and metrics in GA4

Metric.name is required and must not be the empty string

$analytics=new Google_Service_AnalyticsData($client);

      // Create the ReportRequest object.
      $dateRange = new Google_Service_AnalyticsReporting_DateRange();
      $dateRange->setStartDate("7daysAgo");
      $dateRange->setEndDate("today");
    
      // Create the Metrics object.
      $metric = new Google_Service_AnalyticsReporting_Metric();
      $metric->setExpression("ga:city");
    
    
      // Create the Entity object.
      $entity=new Google_Service_AnalyticsData_Entity();
      $entity->setPropertyId("11111111");
    
      // Create the Request object.
      $request = new Google_Service_AnalyticsData_RunReportRequest();
      $request->setEntity($entity);
      $request->setDateRanges($dateRange);
      $request->setMetrics($metric);
      $data=$analytics->v1alpha->runReport($request);