https://community.dynatrace.com/t5/Alerting/How-to-detect-plummet-spike-in-metric-like-disk-free-before-they/m-p/278282#M5675 <P>What is the recommended approach to detect a sudden surge in a metric like disk free?&nbsp;</P><P>Some context:</P><UL><LI>My Prod environment has 60k Disks so automation is required</LI><LI>I am using a Workflow with Davis Forecast Task to predict future disk space exhaustion.&nbsp; However the Workflow runs once a day and will not detect sudden surges in disk usage spikes that occur in between runs of the Forecast.&nbsp;</LI><LI>These surges in disk usage can cause disk free % to plummet in 1-2 hours but aren't yet low enough to register a Problem in DT.&nbsp; e.g. 80% free to 20% free in an hour (see graph below)</LI></UL><P class="lia-indent-padding-left-60px"><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="brandon_camp_0-1748528447800.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/28264i4CFCD7693A2544B8/image-size/medium?v=v2&amp;px=400" role="button" title="brandon_camp_0-1748528447800.png" alt="brandon_camp_0-1748528447800.png" /></span></P><P>Assuming our Workflow Forecast will catch slow disk growth over time, how can we detect sudden dips in disk free %?&nbsp; Was considering creating a calculated metric for rate of change but thought that was too heavyweight.&nbsp; Also was not sure if Anomaly Detection was appropriate for this use case.&nbsp; Any thoughts?&nbsp;</P><P>Thanks!</P> Thu, 29 May 2025 14:29:47 GMT brandon_camp 2025-05-29T14:29:47Z https://community.dynatrace.com/t5/Alerting/How-to-detect-plummet-spike-in-metric-like-disk-free-before-they/m-p/278282#M5675 <P>What is the recommended approach to detect a sudden surge in a metric like disk free?&nbsp;</P><P>Some context:</P><UL><LI>My Prod environment has 60k Disks so automation is required</LI><LI>I am using a Workflow with Davis Forecast Task to predict future disk space exhaustion.&nbsp; However the Workflow runs once a day and will not detect sudden surges in disk usage spikes that occur in between runs of the Forecast.&nbsp;</LI><LI>These surges in disk usage can cause disk free % to plummet in 1-2 hours but aren't yet low enough to register a Problem in DT.&nbsp; e.g. 80% free to 20% free in an hour (see graph below)</LI></UL><P class="lia-indent-padding-left-60px"><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="brandon_camp_0-1748528447800.png" style="width: 400px;"><img src="https://community.dynatrace.com/t5/image/serverpage/image-id/28264i4CFCD7693A2544B8/image-size/medium?v=v2&amp;px=400" role="button" title="brandon_camp_0-1748528447800.png" alt="brandon_camp_0-1748528447800.png" /></span></P><P>Assuming our Workflow Forecast will catch slow disk growth over time, how can we detect sudden dips in disk free %?&nbsp; Was considering creating a calculated metric for rate of change but thought that was too heavyweight.&nbsp; Also was not sure if Anomaly Detection was appropriate for this use case.&nbsp; Any thoughts?&nbsp;</P><P>Thanks!</P> Thu, 29 May 2025 14:29:47 GMT https://community.dynatrace.com/t5/Alerting/How-to-detect-plummet-spike-in-metric-like-disk-free-before-they/m-p/278282#M5675 brandon_camp 2025-05-29T14:29:47Z https://community.dynatrace.com/t5/Alerting/How-to-detect-plummet-spike-in-metric-like-disk-free-before-they/m-p/278291#M5676 <P>I think anomaly detection through either a metric event or Davis Anomaly Detection would solve your issue here. You can set an auto-baselined threshold to be "outside" the bounds, which would alert whether the data points dip or surge. You can tweak the sensitivity of the auto-adaptive threshold as well to suit your needs. We use this across all of our servers, with different thresholds for OS drive versus other drives.</P> Thu, 29 May 2025 16:38:49 GMT https://community.dynatrace.com/t5/Alerting/How-to-detect-plummet-spike-in-metric-like-disk-free-before-they/m-p/278291#M5676 StrangerThing 2025-05-29T16:38:49Z