topic Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes? in Alerting

How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

akash5333 — Fri, 04 Mar 2016 01:19:07 GMT

Hello,

We have both Windows and Linux environments. We want to set up an alert to send an email if the CPU usage of a particular process is constantly 100% during past 10 minutes. Below is the search I have for the CPU usage:

Linux:

host=yyyy index=* COMMAND=java USER=xxxxxx | timechart span=10m limit=0 avg(pctCPU) as "% of CPU Usage"

Windows:

index=* host=zzzz sourcetype="Perfmon:CPU" source="Perfmon:CPU" counter="% Processor Time" | timechart span=10m limit=0 avg(Value) as "% of CPU Usage"

Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

frobinson_splun — Fri, 04 Mar 2016 01:38:13 GMT

Hi @akash5333,
Try creating a real-time alert with rolling time window triggering. This will let you monitor for conditions that occur within a particular time window (in this case, CPU usage in a 10 minute span).

See
http://docs.splunk.com/Documentation/Splunk/6.3.3/Alert/Definerolling-windowalerts

Hope this helps!

Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

JMichaelis — Fri, 04 Mar 2016 09:22:39 GMT

You can use a real-time alert with a rolling window of 10 minutes with the following search:

Linux:

host=yyyy index=* COMMAND=java USER=xxxxxx | stats avg(pctCPU) as CPUUsage | where CPUUsage = 100

Windows:

index=* host=zzzz sourcetype="Perfmon:CPU" source="Perfmon:CPU" counter="% Processor Time" | stats avg(value) as CPUUsage | where CPUUsage = 100

These searches create a result when the avg is at 100, which can only be the case if it has been at a constant 100%.
You then can use the "Per-Result" trigger of the real time alert which triggers if the search returns results.

Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

akash5333 — Fri, 04 Mar 2016 18:08:24 GMT

Hi @frobinson,

Here are my output of my query in the span of 10 minutes, I have set an rolling alert to send email if CPUusage is more than 10 but I never received the alert. Please let me know where I am going wrong.

2016-03-04 09:50:00
1.9
13.6
27.3
3.0
54.6

Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

frobinson_splun — Fri, 04 Mar 2016 18:50:36 GMT

Hi @akash5333,
What are your trigger conditions? Are you throttling the alert at all?

Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

akash5333 — Fri, 04 Mar 2016 18:56:57 GMT

Hi @frobinson,

Yes I have set the throttle for 10 seconds. Here is trigger condition.

Realtime Alert - search pctCPU>10 - in 10 seconds

Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

frobinson_splun — Fri, 04 Mar 2016 19:15:47 GMT

Thanks--taking a look and I'll get back to you soon!

Re: How to create and trigger an alert if the CPU usage is constantly 100% for the past 10 minutes?

frobinson_splun — Fri, 04 Mar 2016 20:13:59 GMT

Hi @akash5333,
I'm not sure which query you are using. Is it one of the original queries you posted or the suggested queries in this post? I think there may be a couple problems with the trigger condition. It sounds like your query renames the average CPU percentage but your trigger condition is checking a field in the original event data.

Keep in mind that a custom trigger condition is a secondary search applied to your base query's results. So you might need to double-check the query result fields to make sure you are using the right fields in the trigger condition.

Also, I'm not sure that the "pctCPU>10" and "in 10 seconds" part of the condition match the alert scenario you mentioned at first. This might be something to double-check too.

Have you tried the suggested queries from @JMichaelis? They might match the scenario you want more closely.

Hope this helps!