Hi,

that's certainly possible.

Simply create a stream containing only the messages of that single system 
(e. g. by checking the value of the "source" message field) and create a 
stream alert which will go off if the stream contains more than X messages 
within the last 60 minutes.

   - http://docs.graylog.org/en/2.1/pages/streams.html
   - 
   
http://docs.graylog.org/en/2.1/pages/streams/alerts.html#message-count-condition


Cheers,
Jochen

On Wednesday, 7 September 2016 19:04:56 UTC+2, ironmanmk42 wrote:
>
> Graylog 1.3.2 (for now and looking to implement graylog 2.1) = 
>
> Is it possible to setup a stream to alert if the number of messages from a 
> single sources exceeds a count?
> I have some misbehaving apps on hosts which suddenly send over a million 
> syslogs in say an hour or two because of a faulty app. 
> It would be great to have a stream which can alert with the source and 
> message count over last 1 hour if say > 1million. 
>
> Thanks,
>

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