# 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:** 4\
**Page:** 1

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**Author:** ![gianluca-valentini](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/gianluca-valentini/32/1592_2.png) [@gianluca-valentini](https://community.graylog.org/u/gianluca-valentini)\
**Post date:** [May 19, 2021, 3:43pm UTC](https://community.graylog.org/t/alert-when-no-message-come-in/19899/1 "2021-05-19T15:43:23Z")

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Hi,  
using Graylog 4 is there a way to have a Slack notification when no messages coming in on a selected Stream?

How I can define the filter and aggregations?

Thanks  
Gianluca

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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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**Author:** ![gianluca-valentini](https://sea2.discourse-cdn.com/flex016/user_avatar/community.graylog.org/gianluca-valentini/32/1592_2.png) [@gianluca-valentini](https://community.graylog.org/u/gianluca-valentini)\
**Post date:** [May 20, 2021, 10:41am UTC](https://community.graylog.org/t/alert-when-no-message-come-in/19899/3 "2021-05-20T10:41:02Z")

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Thanks @H2Cyber

 ![image](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/2X/6/6b6737cb95a2ab3d66c74f283a7ea3cb0cdeb528.png)

 ![image](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/2X/0/06cff5db3e5af6231f62cb0c21379c9470693995.png)

can works for you?  
Thanks  
Gianluca

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/3X/c/7/c7c09c6b5099570133d6502b83f50ba4430de5b6.png) [@system](https://community.graylog.org/u/system)\
**Post date:** [June 3, 2021, 10:41am UTC](https://community.graylog.org/t/alert-when-no-message-come-in/19899/4 "2021-06-03T10:41:54Z")

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Closed on June 3, 2021, 10:41am UTC

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