Metrics Backends

To integrate additional metrics backend into the OpenLineage client, implement the MeterRegistryFactory interface and ensure it is utilized by the MicrometerProvider's getMetricsBuilders method.

The MeterRegistryFactory interface is designed to construct a MeterRegistry object from the OpenLineage configuration map. This interface allows the integration of either custom implementations or existing ones provided by Micrometer.

If your metrics backend requires external dependencies (e.g., io.micrometer:micrometer-registry-otlp:latest), add them to your project's build.gradle as compileOnly. This ensures they are available during compilation but optional at runtime.

Use ReflectionUtils.hasClass to check the existence of required classes on the classpath before using them. This prevents runtime failures due to missing dependencies.

    if (ReflectionUtils.hasClass("io.micrometer.statsd.StatsdMeterRegistry")) {
      builders.add(new StatsDMeterRegistryFactory());
    }