Hi @anandhalagaras1 You already have what you need basically. Go to settings -> Sarch, Reports and Alerts, click "new Alert" in top right. As search you would put in for example index=windows sourcetype=dns Make sure Alert Type is set to "Scheduled" and select "Run on Cron Schedule" Use this Cron Expression */15 * * * * (run every 15th minute). As Time Range select "Last 15 Minutes". As Trigger Condition set: "Number of Results" and "is equal to " 0. At the bottom you can configure the kind of alert action you need (email, webhook posting, call the police...) Hope this helps. BR Ralph Edit: Instead of returning all the Events, it would be better (from a performance/ressource usage pov) to run a stats command like: index=windows sourcetype=dns | stats count And alert based on the count field. So, once you have the alerting running, this would be a good point to optimize it.
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