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kechangqing
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Update ring-compare.md
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doc/wiki/ring-compare.md

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假设离当前时间点最近的自然小时的数值为current, 前一自然小时的数值为reference。那么报警的触发条件是
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```
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(current - reference) * 100 / refercence >= 20 && |current - reference| >= 1000
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(current - reference) * 100 / refercence >= 1 && |current - reference| >= 100
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```
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使用环比来比较相邻时间周期数据的变化;

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