php – 如何记录AWS CloudWatch捆绑指标等维度

我使用以下PHP代码,但选择菜单显示“ELB：AvaliabiltyZone”,如何使其显示“由AvaliabiltyZone聚合”？这里使用的逻辑是什么？

$response = $cw->put_metric_data("ELB",array(  
    array(  
        "MetricName" => "Latency","Dimensions" => array(  
            array("Name" => "AvaliabiltyZone","Value" => "us-east-1c")
        ),"Timestamp" => "Now","Value"     => 1,"Unit"      => "None"  
    ),));