# Raise an alert when a device goes down

**URL:** <https://discuss.elastic.co/t/raise-an-alert-when-a-device-goes-down/238666>\
**Category:** Kibana\
**Tags:** kql-kibana-query-language\
**Created:** [June 25, 2020, 12:20pm UTC](https://discuss.elastic.co/t/raise-an-alert-when-a-device-goes-down/238666 "2020-06-25T12:20:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Anirudhan](https://avatars.discourse-cdn.com/v4/letter/a/91b2a8/32.png) [@Anirudhan](https://discuss.elastic.co/u/Anirudhan)\
**Post date:** [June 25, 2020, 12:20pm UTC](https://discuss.elastic.co/t/raise-an-alert-when-a-device-goes-down/238666/1 "2020-06-25T12:20:57Z")

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Basically I am trying to raise an alert when a device goes down. But want to raise an alert after 20 mins. For eg:-  
**{"hostName": "WIN\_27806", "status": false,"lastChangedTime": Jun 25, 2020 @ 16:58:38.000}**  
Can the query be like this in kibana.  
**status : false and now \> "lastChangedTime+20m"**

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 23, 2020, 12:21pm UTC](https://discuss.elastic.co/t/raise-an-alert-when-a-device-goes-down/238666/2 "2020-07-23T12:21:05Z")

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