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。
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。
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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