# Kibana: rule compares difference of two aggregations
**URL:** https://discuss.elastic.co/t/kibana-rule-compares-difference-of-two-aggregations/305393
**Category:** Kibana
**Tags:** elastic-stack-alerting
**Created:** [May 23, 2022, 11:34am UTC](https://discuss.elastic.co/t/kibana-rule-compares-difference-of-two-aggregations/305393 "2022-05-23T11:34:29Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Johannnnnn](https://discuss.elastic.co/u/Johannnnnn)
#### Post date: [May 23, 2022, 11:34am UTC](https://discuss.elastic.co/t/kibana-rule-compares-difference-of-two-aggregations/305393/1 "2022-05-23T11:34:29Z")
I got two aggregations, both calculating the run time of a test suite differentiating on the specific release. So the results are two long numbers (nanoseconds).
I want to create an alert to send me an e-mail when the difference between the newest and older time is over 10 percent. Does it just take an elaborate KQL or should I look elsewhere?
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### Author:  [@richcollier](https://discuss.elastic.co/u/richcollier)
#### Post date: [May 31, 2022, 4:44pm UTC](https://discuss.elastic.co/t/kibana-rule-compares-difference-of-two-aggregations/305393/2 "2022-05-31T16:44:08Z")
Looks like a job for [Watcher](https://www.elastic.co/guide/en/kibana/current/watcher-ui.html#watcher-create-advanced-watch)
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 28, 2022, 4:44pm UTC](https://discuss.elastic.co/t/kibana-rule-compares-difference-of-two-aggregations/305393/3 "2022-06-28T16:44:53Z")
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