chore: release v3.0.0

[seemk]

• Raise the minimum required Node.js version to 18. If Node <18 is a requirement, 2.x is still maintained and package versions 2.x can be used..
• Change the default OTLP protocol from grpc to http/protobuf. The default exporting endpoint has been changed from http://localhost:4317 to http://localhost:4318. Signal specific URL paths are automatically added when choosing the endpoint, e.g. when endpoint is set to http://collector:4318, /v1/traces is added for traces.
• Change the default sampler from parentbased_always_on to always_on.
• Improve the start API to avoid duplicating parameters in the signal specific configuration.
  • Add resource field - a function which can be used to overwrite or add additional parameters to the resource detected from the environment.

    import { start } from '@splunk/otel';
    import { Resource } from '@opentelemetry/resources';
    start({
      serviceName: 'example',
      resource: (detectedResource) => {
        return detectedResource.merge(new Resource({ 'service.version': '0.2.0' }));
      },
    });

  • Add realm field. When set passes the access token and realm to signals.

    import { start } from '@splunk/otel';
    start({
      serviceName: 'example',
      realm: 'us0',
      accessToken: '<token>'
    });
    // Traces and metrics are now sent to the us0 backend.

  Signal specific options can still be used and take preference over the shared configuration options.
• Profiling configuration: resource: Resource field has been changed to resourceFactory: (resource: Resource) => Resource to bring it in line with tracing and metrics configuration.
• splunk.distro.version (automatically added resource attribute) has been removed and is replaced with telemetry.distro.version and telemetry.distro.name.
• SPLUNK_METRICS_ENDPOINT environment variable has been removed. Use the OpenTelemetry specific OTEL_EXPORTER_OTLP_METRICS_ENDPOINT instead.
• Fix logging of service.name attribute not set from each signal, when the service name is not set.
• Add prebuilt binaries for Node.js 22 and 23.
• Upgrade to OpenTelemetry 1.30.0 / 0.57.0.