Custom alerts for individual tomcat thread pools
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?
Best Answer
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
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-threshold/
- 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
