如果你看一下apache请求的有效负载，你可以看到requiredData，类似于：

{
    "0":[
        [{"type":"statusvar","name":"Questions"}]
    ],
    "1":[
        [{"type":"statusvar","name":"Connections"}],
        [{"type":"proc","name":"processes"}]
    ],
    "2":[
        [{"type":"statusvar","name":"Bytes_sent"}],
        [{"type":"statusvar","name":"Bytes_received"}]
    ],
    "3":[
        [{"type":"cpu","name":"loadavg"}]
    ],
    "4":[
        [{"type":"memory","name":"MemUsed"}],
        [{"type":"memory","name":"MemFree"}]
    ],
    "5":[
        [{"type":"memory","name":"SwapUsed"}],
        [{"type":"memory","name":"SwapFree"}]
    ]
}

字符串
使用"type":"statusvar"列出的变量是使用SHOW GLOBAL STATUS WHERE Variable_name=...检索的，如在Server/Status/Monitor.php中所示：

// Retrieve all required status variables
$statusVarValues = [];
if (count($statusVars)) {
    $statusVarValues = $this->dbi->fetchResult(
        "SHOW GLOBAL STATUS WHERE Variable_name='"
        . implode("' OR Variable_name='", $statusVars) . "'",
        0,
        1
    );
}

型
如果你看一下refreshChartGrid()，你可以看到PMA正在将每个aerodynamic调用中接收到的值与前一个调用中的值进行比较。对于连接，它使用的是Connections的值，而不是Threads_connected的值，后者被aerodynamic使用。