topic Re: Create chart about JVM memory allocation and used for dashboard in Dashboarding

Create chart about JVM memory allocation and used for dashboard

cleoleeps1 — Tue, 19 Nov 2024 16:42:19 GMT

In our host's process, we can find the heap memory chart under JVM metrics tab.

It has 3 metrics:

Committed memory
Used Memory
Garbage collection time

May I know wow can I create the same? Because I would like to add into a dashboard for monitoring along with other charts.

I tried the built-in metric in data explorer, however, the value is never the same as the screenshot above.

It was showing around 300MiB - 500 MiB. Not even close to 2.5GiB.

Appreciate some pointers here. Thank you!

Re: Create chart about JVM memory allocation and used for dashboard

Nick-Montana — Tue, 19 Nov 2024 16:44:27 GMT

Hi!

You can easily create a dashboard and query JVM metrics through the Dynatrace Data Explorer. Here are all the possible options for JVM metrics

builtin:tech.jvm.classes.loaded	JVM loaded classes
builtin:tech.jvm.classes.total	JVM total number of loaded classes
builtin:tech.jvm.classes.unloaded	JVM unloaded classes
builtin:tech.jvm.memory.gc.activationCount	Garbage collection total activation count
builtin:tech.jvm.memory.gc.collectionTime	Garbage collection total collection time
builtin:tech.jvm.memory.gc.suspensionTime	Garbage collection suspension time
builtin:tech.jvm.memory.pool.collectionCount	Garbage collection count
builtin:tech.jvm.memory.pool.collectionTime	Garbage collection time
builtin:tech.jvm.memory.pool.committed	JVM heap memory pool committed bytes
builtin:tech.jvm.memory.pool.max	JVM heap memory max bytes
builtin:tech.jvm.memory.pool.used	JVM heap memory pool used bytes
builtin:tech.jvm.memory.runtime.free	JVM runtime free memory
builtin:tech.jvm.memory.runtime.max	JVM runtime max memory
builtin:tech.jvm.memory.runtime.total	JVM runtime total memory
builtin:tech.jvm.memory.memAllocationBytes	Process memory allocation bytes
builtin:tech.jvm.memory.memAllocationCount	Process memory allocation objects count
builtin:tech.jvm.memory.memSurvivorsBytes	Process memory survived objects bytes
builtin:tech.jvm.memory.memSurvivorsCount	Process memory survived objects count
builtin:tech.jvm.threads.avgActiveThreadCount	JVM average number of active threads
builtin:tech.jvm.threads.avgInactiveThreadCount	JVM average number of inactive threads
builtin:tech.jvm.threads.count	JVM thread count

Go to the data explorer and type in the metric and filter down to your service. Do the same with all the JVM metrics you'd like to query.

When you created the chart hit "Pin to Dashboard"

Re: Create chart about JVM memory allocation and used for dashboard

cleoleeps1 — Tue, 19 Nov 2024 17:15:40 GMT

Hello Nick, thanks for your post. I'm aware of the method you mentioned. Still appreciate your time.

I found the issue for not accurate value (showed much lesser JVM memory) I mentioned above.
It is because I can't use "Auto". I should use "Sum" instead in the equation. Then it is the same as per the host's process JVM.

Re: Create chart about JVM memory allocation and used for dashboard

KylerNelson — Tue, 19 Nov 2024 19:02:11 GMT

Split by poolname and filter poolname:JavaHeap on builtin:tech.jvm.memory.pool.committed