# Alert when no message come in

**URL:** <https://community.graylog.org/t/alert-when-no-message-come-in/19899>\
**Category:** Graylog Central (peer support)\
**Created:** [May 19, 2021, 3:43pm UTC](https://community.graylog.org/t/alert-when-no-message-come-in/19899 "2021-05-19T15:43:23Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![H2Cyber](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/h2cyber/32/12536_2.png) [@H2Cyber](https://community.graylog.org/u/H2Cyber)\
**Post date:** [May 19, 2021, 8:48pm UTC](https://community.graylog.org/t/alert-when-no-message-come-in/19899/2 "2021-05-19T20:48:58Z")

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> [@Alerting/Notification when certain sources are not reporting](https://community.graylog.org/t/alerting-notification-when-certain-sources-are-not-reporting/19332/9):
>
> Here is a suggestion : Create an event definition that runs every X minutes (define X as you see fit). In aggregation, define a condition based on the card() of the “source” field. If it is anything less than your number of sources, fire an alert.

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