Dynatrace not noticing sudden CPU increase

[dantonag]

Hello,

we have a Dynatrace SaaS instance monitoring some of our local hosts.

Today at 8.40, the CPU on one of the hosts spiked from 20% (normal usage) to 70% (still is at 70%).

Dynatrace didn't signal anything in the "Problems" section. Why?

I'm attaching a graph of the CPU.

Furthermore, in the Settings->Anomaly detection->Infrastructure, the "Detect CPU saturation on host" setting is active. Maybe 70% is not a sufficient value to trigger an alarm?

Thanks

[pahofmann · Accepted solution]

As you suggested yourself, 70% is not enough to trigger a problem. 

You can find the defaults in the documentation.  For CPU Usage on a Host it is 95% in 3 of 5 one-minute intervals.

You can change this setting environment-wide, for a host group or a single host.

[Marcelo_santand]

@dantonag    

Possibly the conditions for an alert to be generated are not met. You can create your own alerts in which you can define a more sensitive threshold and under the conditions that you want.

Best Regards!