Datadog supports regexes to match JMX Mbean names and domain names to configure your include and exclude filters. The regexes must conform to Java’s regular expression format. Note that these filters were added in version 5.5.0.

Capture groups from the provided regex can be used to supply additional tag values for your metrics.

This article provides one example of how to use the bean_regex from the Java integration, and how to reference such capture groups to set additional tags.

Suppose you have the following Mbean name: domain.example.com:name=my.metric.name.env.dev.region.eu-central-1.method.GET.status.200. There is some information you could use as tags once the Agent has collected the metric. For instance, you could export a metric with the following tags:

• env: dev
• region: eu-central-1
• method: GET
• status: 200

Bean regexes can be supplied as a single regex or a list of regex expressions. For the latter, only the first entry of the list that matches will be taken into account. See an example of a configuration file to export your custom metrics with some additional tags:

init_config:
  is_jmx: true

instances:
  - host: "<JMX_ENDPOINT>"
    port: "<JMX_PORT>"

    conf:
      - include:
          domain: domain.example.com
          bean_regex:
            - "domain.example.com:name=my.metric.name.*(?:\\.env\\.)([a-z]+)(?:.*\\.region\\.)([a-z-]+[0-9])(?:.*\\.method\\.)([A-Z]+)(?:.*\\.status\\.)([0-9]+)(?:.*)"
          attribute:
            attribute1:
              metric_type: gauge
              alias: "my.jmx.metric"
          tags:
              env: $1
              region: $2
              method: $3
              status_code: $4
              optional: tag

Each capture group is stored in a Java Map. The first capture group starts at position 0. After you have determined which capture group you want to export as a tag, you need to reference them in the tags section of your include or exclude filter, as well as to the number of the group (for example, the position inside the Map).

For the provided example in bean_regex, the capture groups are:

• $0: domain.example.com:name=my.metric.name.env.dev.region.eu-central-1.method.GET.status.200
• $1: dev
• $2: eu-central-1
• $3: GET
• $4: 200

Using the Metrics Explorer, you are able to query your metrics and filter them by the tags you have just created.

Further Reading

Additional helpful documentation, links, and articles:

Java integrationDOCUMENTATION View JMX data in jConsole and set up your jmx.yaml to collect themDOCUMENTATION