The right pane, named variable pane, lists the variables required for metrics calculation.

右边的面板（名为 variable）列出指标计算所需的变量。

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For -append and -prefix, the value associated with the named variable must be a single string value.

对于- append和- prefix，与指定变量关联的值必须是单个字符串值。

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If the var attribute is specified, then a String value containing the formatted date is assigned to the named variable.

如果指定了var属性，那就把包含格式化日期的string值指派给指定的变量。

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