As Mark says, there's nothing built in. Approaches that I've read about for 
bolting alerting onto ELK:

1) Use Logstash to output to some other alerting pipeline, such as: email, 
Nagios, Riemann.
2) Write a cron job / scheduled task to run Elasticsearch queries 
periodically and take action based on the results. This is not part of 
Logstash or Kibana; you need to write it yourself. I believe the MozDef 
project has some code to do this: https://github.com/jeffbryner/MozDef.
3) Write your own indexer that makes use of Elasticsearch percolators. 
Percolators allow you to match indexed queries against new indexed 
documents, which is kind of like alerting. Again, you'd need to write it 
yourself.



On Friday, November 7, 2014 9:48:41 AM UTC-7, Wish wrote:
>
> I am new to ELK stack. I guess, I understand ELK can be used for log 
> management. You can view the details on dash board using kibana etc.
>
> however, one question, can we have an alerting system as an extension of 
> ELK stack ?
>

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