我试图了解如何获得chronograf Jmeter 板设置，以便显示特定的windows磁盘（sqlserver）。给出整个磁盘系统的基本查询：

SELECT mean("Percent_Free_Space") AS "mean_Percent_Free_Space" FROM "flajacksdb"."autogen"."win_disk" WHERE time > :dashboardTime: AND "host"='wafflehousesqlserver' GROUP BY time(:interval:) FILL(null)

我想我可以这样做来过滤z驱动器：

SELECT mean("Percent_Free_Space") AS "mean_Percent_Free_Space" FROM "flajacksdb"."autogen"."win_disk"."Instances"."Z" WHERE time > :dashboardTime: AND "host"='wafflehousesqlserver' GROUP BY time(:interval:) FILL(null)

但这并不返回数据。有人知道如何过滤较低的物体吗？