Can we monitor Heap Memory of Java application installed on Azure Vm's using Azure Monitor

Question

Can we monitor Heap Memory of Java application installed on Azure Vm's using Azure Monitor

Paras N. Rambhiya 26

Hello Team,
Is it possible to monitor heap memory of java application deployed on Azure Vm's . We have application insights available/tagged on the machine. I have added below metrics in applicationinsights.json file. But I couldn't see the metrics. Can you please let us know how to move ahead.

"jmxMetrics": [
{
"name": "JVM uptime (millis)",
"objectName": "java.lang:type=MemoryPool",name=Tenured Gen",
"attribute": "Usage.used"
},
{
"name": "Heap Used",
"objectName": "java.lang:type=Memory",
"attribute": "HeapMemoryUsage.used"
}

]

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Answer 1

AnuragSingh-MSFT 21,546 Moderator

Hi @Paras N. Rambhiya

Welcome to Microsoft Q&A! Thanks for posting the question.

I understand that you are trying to measure heap related memory utilization by JVM. I would recommend referring this this doc for relevant information - Configuring JMX metrics

To Summarize, Application Insights Java 3.x collects some of the JMX metrics by default. If the default ones are not enough, you can collect additional metrics by configuring the jmxMetrics section to the applicationinsights.json file. Please note that, to be able to update the jmxMetrics section, you must know the object names and the attributes, those properties are different for various libraries, frameworks, and application servers, and are often not well documented. To be able to view the available metrics, et the self-diagnostics level to DEBUG in your applicationinsights.json configuration file. This would give you all the available JMX metrics, with object names and attribute names in the application insights log file, which can be used to update the jmxMetrics section to the applicationinsights.json file.

The following link has the complete information in this regards: Configuring JMX metrics.

Please let me know if you have any questions.

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Paras N. Rambhiya 26 Reputation points

2022-03-31T11:02:36.333+00:00

Thanks Anurag, I am able to see now Heap used metric. Do we have a reference page for all JMX attributes which are supported. Also how to add JDBC pool utilization graphs in this?
AnuragSingh-MSFT 21,546 Reputation points Moderator

2022-03-31T14:43:13.447+00:00

@Paras N. Rambhiya , thank you for the update.
I don't think there is a definite ref page for all supported JMX attributes as they may be different for various libraries, frameworks, and application servers. The best way to list out all the supported metrics/specs would be to set the self-diagnostics level to DEBUG in your applicationinsights.json configuration file. This would give you all the available JMX metrics, with object names and attribute names in the application insights log file. Ref: How do I know what metrics are available to configure?

Regarding JDBC connection pool utilization monitoring, you would have to refer to specific JDBC driver's doc/resource - on how to monitor them and forward data to AppInsingts workspace.

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Paras N. Rambhiya 26 Reputation points

2022-04-01T13:26:08.567+00:00

Thanks a lot Anurag this helped. Just quick question what is recommended level to be kept for self-diagnostics ? ERROR or DEBUG?

Thanks
Paras
AnuragSingh-MSFT 21,546 Reputation points Moderator

2022-04-06T06:04:32.037+00:00

@Paras N. Rambhiya , thank you for the confirmation. By default, the "selfDiagnostics" is set to INFO level, which can be used for most cases and in production. For classification of self-diagnostics levels available for internal logging from Application Insights Java 3.x., please refer to Self-diagnostics

To get an overview of various levels available and what do they signify, please refer to the explanation available in this table.

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Paras N. Rambhiya 26 Reputation points

2022-04-06T06:18:52.977+00:00

Thanks for information Anurag. It helps.

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Can we monitor Heap Memory of Java application installed on Azure Vm's using Azure Monitor

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