JVM

The JVM integration collects JVM metrics exposed through Java Management Extensions (JMX). The integration primarily collects metrics on memory and garbage collection. Additional runtime metrics, such as thread count and classes loaded, are also available.

Prerequisites

To collect JVM metrics, you must install Ops Agent version 2.2.0 or higher.

This receiver supports Java versions 11 and 16.

Configure your JVM

To expose a JMX endpoint, you must set the com.sun.management.jmxremote.port system property when starting the JVM. We also recommend setting the com.sun.management.jmxremote.rmi.port system property to the same port.

To expose a JMX endpoint remotely, you must also set the java.rmi.server.hostname system property.

To set system properties by using command-line arguments, prepend the property name with -D when starting the JVM.

For example, to set com.sun.management.jmxremote.port to port 9999, specify the following when starting the JVM:

-Dcom.sun.management.jmxremote.port=9999

Configure the Ops Agent for JVM

Following the guide for Configuring the Ops Agent, add the required elements to collect metrics from your JVM instances, and restart the agent.

Example configuration

The following command creates the configuration file to collect metrics for JVM and restarts the Ops Agent on Linux.

sudo tee /etc/google-cloud-ops-agent/config.yaml > /dev/null << EOF
metrics:
  receivers:
    jvm:
      type: jvm
      endpoint: localhost:9999
  service:
    pipelines:
      jvm:
        receivers:
          - jvm
EOF
sudo service google-cloud-ops-agent restart

In this example, the com.sun.management.jmxremote.port and com.sun.management.jmxremote.rmi.port system properties were set to 9999, and the java.rmi.server.hostname system property was set to 127.0.0.1. For more information, see Configure metrics collection.

Configure metrics collection

To collect metrics from JVM instances, you must create a receiver for JVM metrics and then create a pipeline for the new receiver. To configure a receiver for your JVM metrics, specify the following fields:

Field	Default	Description
`type`		The value must be `jvm`.
`endpoint`	`localhost:9999`	The JMX Service URL or host and port used to construct the service URL. This value must be in the form of `service:jmx:<protocol>:<sap>` or `host:port`. Values in `host:port` form are used to create a service URL of `service:jmx:rmi:///jndi/rmi://<host>:<port>/jmxrmi`.
`username`		The configured username if JMX is configured to require authentication.
`password`		The configured password if JMX is configured to require authentication.
`collection_interval`	`60s`	A time.Duration value, such as `30s` or `5m`.

What is monitored

The following table provides the list of metrics that the Ops Agent collects from the JVM instance.

Metric type
Kind, Type Monitored resources	Labels
`workload.googleapis.com/jvm.classes.loaded`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.gc.collections.count`
`CUMULATIVE`, `INT64` gce_instance	`name`
`workload.googleapis.com/jvm.gc.collections.elapsed`
`CUMULATIVE`, `INT64` gce_instance	`name`
`workload.googleapis.com/jvm.memory.heap.committed`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.heap.init`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.heap.max`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.heap.used`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.nonheap.committed`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.nonheap.init`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.nonheap.max`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.nonheap.used`
`GAUGE`, `INT64` gce_instance
`workload.googleapis.com/jvm.memory.pool.committed`
`GAUGE`, `INT64` gce_instance	`name`
`workload.googleapis.com/jvm.memory.pool.init`
`GAUGE`, `INT64` gce_instance	`name`
`workload.googleapis.com/jvm.memory.pool.max`
`GAUGE`, `INT64` gce_instance	`name`
`workload.googleapis.com/jvm.memory.pool.used`
`GAUGE`, `INT64` gce_instance	`name`
`workload.googleapis.com/jvm.threads.count`
`GAUGE`, `INT64` gce_instance

Sample dashboard

You can view the metrics from this integration using a sample Cloud Monitoring dashboard. Complete the Installing sample dashboards procedures to import the JVM GCE Overview dashboard from the Sample library and view charts that display your JVM metrics.

Verify the configuration

You can use the Metrics Explorer to verify that you correctly configured the JVM receiver. It might take one or two minutes for the Ops Agent to begin collecting metrics.

To verify the metrics are ingested, go to Metrics Explorer and run the following query in the MQL tab.

fetch gce_instance
| metric 'workload.googleapis.com/jvm.gc.collections.count'
| align rate(1m)
| every 1m

What's next

For a walkthrough on how to use Ansible to install the Ops Agent, configure a third-party application, and install a sample dashboard, see the Install the Ops Agent to troubleshoot third-party applications video.