Solr metrics

The OpenTelemetry Collector, when configured with a JMX receiver, provides an integration with Solr. The Collector fetches Solr metrics from JMX. From there the metrics are processed and exported to Cloud Observability.

To complete the integration, you will:

Configure the JMX receiver for the Collector to ingest Solr metrics
Enable the integration by adding it to a pipeline

Prerequisites

Java 8, to run Solr:
- OpenJDK
- Oracle Java SE
Apache Solr v9 or later
A running Solr instance
OpenTelemetry JMX Metric JAR release version 1.9 or later.
The path to the opentelemetry-jmx-metrics.jar file.
You’ve configured the Collector to export metric data to Cloud Observability.

Solr reporting

The Solr JMX receiver periodically fetches metrics using a built-in OpenTelemetry helper utilizing a Groovy script. The script is configured to poll both the JMX Agent and the OpenTelemetry JMX Metric Gatherer operation.

For more details regarding configuring the Solr remote connection, see the official Solr documentation.

Configure the Collector receiver

In the Collector configuration file, add JMX as a receiver and set the following:

jar_path: The path to the opentelemetry-jmx-metrics.jar file.
endpoint: The hostname/IP address and port or unix socket file path of the Solr instance
target_system: The metrics to collect. Valid values for this integration are jvm and solr

receivers:
  jmx:
    jar_path: /opt/opentelemetry-jmx-metrics.jar
    endpoint: "localhost:9999"
    target_system: jvm,solr
    

The OpenTelemetry repo’s readme provides additional details about JMX configuration.

Enable the Collector receiver

Once the Solr receiver is configured, enable it by adding it to one or more pipelines as described in the Collector configuration documentation.

Validate metrics are reporting to Cloud Observability

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 Solr metric names.

See the OpenTelemetry repo for a complete list of emitted metrics.
If needed, click on the metric to edit the description and how the units are displayed in Cloud Observability.

Create a dashboard for the metrics

Use the Cloud Observability Terraform Provider to create a dashboard for the metrics.

Additional resources

For a more complete example that’s ready to run, see the Solr integration in Cloud Observability OpenTelemetry Examples.