Custom alerts for individual tomcat thread pools

[Enrico_F]

I would like to receive an alert when the number of busy threads in a specific thread pool reaches a fixed threshold.

I can see the thread pool in the process metrics - for example "https-jsse-nio-8443" as shown here:

However, it seems it's not possible to create a custom alert for the above thread pool alone as only the total is available as metric "Tomcat busy threads":

Is there any way around that or is that a known limitation and potential candidate for an RFE?

[skrystosik]

The only workaround you can do is push information about thread pools state to dynatrace, and there are some options for that:

• Expose them via JMX -> then you can create custom JMX plugin. This will create custom metrics and on them you can setup static thresholds / custom alerts -> https://www.dynatrace.com/news/blog/jmx-plugins-editor-now-available-eap/ and for thresholds api -> https://www.dynatrace.com/support/help/extend-dynatrace/dynatrace-api/environment-api/thresholds/put...
• Create OneAgent plugin -> you can write simple python plugin that will collect those metrics from tomcats and send them to Dynatrace as Custom Metrics
• Use Dynatrace timeseries API -> you can create dynatrace agnostic solution that will fetch such metrics to dynatrace via rest api as custom metrics.

I think best option will be the first one.

Sebastian

[Enrico_F]

Hi Sebastian.

I'll reate a JMX plugin then to have this covered until 180 is pushed to our cluster.

Thanks!

[wolfgang_beer · Accepted solution]

Hi Enrico,

You will love this upcoming feature. Its already pretty close to general availability. Will be available in release 179 (Dynatrace SaaS) and 180 Dynatrace Managed.

Best greetings,

Wolfgang

[skrystosik]

Cool! Super handy thing 😉

[Enrico_F]

Hi Wolfgang,

That's the feature I expected to see from the start - so yes, definitely looking forward 🙂

Thanks for the feedback!