histogram.ewmaStddev

• 类型：<number>

指数加权移动标准差。只有在使用大于 0 的 halfLife 选项创建直方图时才会生效。当 EWMA 被禁用或没有记录任何值时，返回 0。

🌐 The exponentially weighted moving standard deviation. Only active when the histogram was created with a halfLife option greater than 0. Returns 0 when EWMA is disabled or no values have been recorded.