The OpenTelemetry Collector provides an integration with Apache Tomcat to ingest metrics. When configured to use the JMX/Tomcat integration, the Collector fetches metrics from a target MBean server using built-in profiles for Tomcat. From there the metrics are processed and exported to Cloud Observability.
To complete the integration, you will:
Configure a JMX remote connection for the Collector receiver to connect to the executing Java Virtual Machine.
This example shows JMX configuration (without authentication) by setting the
CATALINA_OPTS environment variable:
1 2 3 4 export CATALINA_OPTS=-Dcom.sun.management.jmxremote \ -Dcom.sun.management.jmxremote.port=$PORT_NUMBER \ -Dcom.sun.management.jmxremote.ssl=false \ -Dcom.sun.management.jmxremote.authenticate=false
For more details regarding configuring the Tomcat remote connection, see the official Tomcat documentation.
Add JMX/Tomcat as a receiver and set the following:
jar_path: The path to the OpenTelemetry JMX metrics jar file.
endpoint: The endpoint of the host:port for the running application. This should be the same port used in the JMX configuration, above.
target_system: The metrics to collect. Values can this integration are
1 2 3 4 5 6 7 receivers: jmx/tomcat: # Default is /opt/opentelemetry-java-contrib-jmx-metrics.jar jar_path: /opt/opentelemetry-jmx-metrics.jar endpoint: tomcat:9090 # Required. target_system: jvm,tomcat # Required.
The OpenTelemetry repo’s readme provides additional details about JMX configuration.
Once the Tomcat receiver is configured, enable it by adding it to one or more pipelines as described in the Collector configuration documentation.
You can validate that metrics are reporting to Cloud Observability on the Metrics details page in Project settings.
In Cloud Observability, click Project settings > Metric details.
Search for Tomcat metric names.
If needed, click on the metric to edit the description and how the units are displayed in Cloud Observability.
For a more complete example that’s ready to run, see the Tomcat integration in Cloud Observability OpenTelemetry Examples.
Updated Dec 1, 2022