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alerts-correlated_alerts.html
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<h3>Correlated Alerts</h3>
<p>Correlated alerts can seem quite daunting but in reality they're really quite simple and offer great functionality. </p>
<p>If you've never configured an alert you can read the alerts page <a href="alerts.html">Here</a>.</p><br/><strong>Configuration</strong><img src="http://blog.logscape.com/wp-content/uploads/2015/11/jP19Wro.png" style="float:right"/>
<p>Correlated alerts can be found at the bottom of the trigger tab on the alert's page, while there seems to be alot of fields, it's really quite simple.</p>
<p><strong>Time Window </strong>- The time, in seconds, to look for the events you will later specify.</p>
<p><strong>Type </strong>- Sequence or average, sequence expects specific events in a, well, sequence, whereas average is the average across your time window.</p>
<p><strong>Event Value </strong>- In the case of average, this is the value you want to alert on, if you've chosen your type as sequence however, this is a comma separated list of values to look for in sequence.</p>
<p><strong>Correlation Field </strong>- The field which will be evaluated</p>
<p><strong>Correlation Key </strong>- A value to group by, for example specifying _host, means it would use avg value by host, or look for a specific host which had a sequence of events.</p><br/><br/><br/><strong>Example</strong>
<p>Below is a brief example of a correlated alert that is configured in our environment</p><img src="http://blog.logscape.com/wp-content/uploads/2015/11/tTLkR6X.png"/><br/>
<p>This is a simple search to capture any event which contains an error code, for help creating your search you can check out the <a href="searching.html">searching docs</a>. Moving on to how I've got my correlation configured, it's really quite simple.</p><img src="http://blog.logscape.com/wp-content/uploads/2015/11/86t8j6K.png"/><br/>
<p>My alert is going to look over a 60 second time period, it's going to look for a sequence of events, More accurately it's going to look for four '10's in a row (FTP Username/Password Incorrect), and it's going to look at the AlertCode field from my search, and finally, it's going to group the events by _srcIP so that four different IP's failing to login won't trigger my alert, you need to fail four times, from the same _srcIP. If my values meet this criteria, my alert will fire, and whatever you specify in your actions tab, will be performed, for us it's a simple email, but there are quite a few different possibilities, all of which are covered in the <a href="alerts.html">alerting docs</a>.</p><br/><br/><br/>
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