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JMX Checks Development

JMXFetch is the component of the Agent which is responsible for collecting metrics from Java applications.

These docs are intended to help you test changes to either JMXFetch or JMX-based integrations locally. In other words, you've made changes to how JMXFetch works and you'd like to run JMXFetch via the Agent to validate your changes.

Stable JMXFetch

If your goal is to run a JMX-based check and you don't need a custom version of JMXFetch, follow the instructions below:

  1. Download the -jar-with-dependencies.jar build of the latest version of JMXFetch from maven
  2. Copy the jar file and rename it to $GOPATH/src/github.com/DataDog/datadog-agent/dev/dist/jmx/jmxfetch.jar.
  3. Run deva agent.run.
  4. Validate that the JMXFetch section appears in agent status.

If you have a JMX-based integration configured to run, it automatically runs in your local JMXFetch instance.

Custom Build of JMXFetch

  1. Build JMXFetch.
  2. Copy the resulting jar into $GOPATH/src/github.com/DataDog/datadog-agent/dev/dist/jmx/jmxfetch.jar.
  3. Run deva agent.run.
  4. Validate that the JMXFetch section appears in agent status.

If you have a JMX-based integration configured to run, it should automatically be run in your local JMXFetch instance.

Custom JMX-based Check

  1. Run your JMX server listening on localhost.
    1. A testing JMX server can be found here.
  2. Add a check configuration that specifies how to connect to your JMX server
    • An example for the above test server can be found in the jmxfetch repo.
    • This config should live in dev/dist/conf.d/jmx-test-server.d/conf.yaml.
  3. Run deva agent.run.
  4. Validate that the check appears as scheduled in agent status.