topic Re: Dynatrace not noticing sudden CPU increase in Alerting

Dynatrace not noticing sudden CPU increase

dantonag — Tue, 30 Mar 2021 10:22:04 GMT

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

Re: Dynatrace not noticing sudden CPU increase

pahofmann — Tue, 30 Mar 2021 11:00:30 GMT

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.

Re: Dynatrace not noticing sudden CPU increase

Marcelo_santand — Thu, 13 May 2021 14:00:49 GMT

@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!