What Does This Do

Replaces the DatadogMeterProvider.shutdown() API added by #12317 with the standard java.io.Closeable interface. The MeterProvider returned by GlobalOpenTelemetry now implements Closeable, like the OpenTelemetry SDK SdkMeterProvider:

MeterProvider meterProvider = GlobalOpenTelemetry.get().getMeterProvider();
if (meterProvider instanceof Closeable) {
  ((Closeable) meterProvider).close();
}

close() performs a final export of the recorded metrics, then shuts down the OTLP metrics exporter. It waits up to 10 seconds for the final export, like SdkMeterProvider.close(). Repeated calls wait for the same final export, which runs only once. It does nothing when the OTLP metrics exporter is not running.

Motivation

• No new public API: Expose OpenTelemetry metrics shutdown through MeterProvider #12317 is not released yet (milestone 1.68.0). Removing its dd-trace-api types now means they never ship and never need a deprecation cycle.
• Standard interface: applications only use the OpenTelemetry API and java.io.Closeable, following the SDK convention where SdkMeterProvider is Closeable. They need no dd-trace-api dependency, and the instanceof check skips the no-op provider when the agent is not attached.
• No tracer changes: the shim reaches the OTLP metrics service through the bootstrap OtelMetricRegistry it already shares with dd-trace-core. The service registers its shutdown action when it starts, so TracerAPI needs no OpenTelemetry metrics lifecycle method.

Additional Notes

• Behavior change from Expose OpenTelemetry metrics shutdown through MeterProvider #12317: callers no longer get a result to join with their own timeout. close() blocks up to 10 seconds and does not report the export outcome; failures are still counted by the OTLP metrics telemetry and logged at debug level.
• Same limitation as Expose OpenTelemetry metrics shutdown through MeterProvider #12317 when called from a JVM shutdown hook: if the agent scheduler has already stopped, the final export does not run and close() waits the full 10 seconds.
• The release notes entry of Expose OpenTelemetry metrics shutdown through MeterProvider #12317 describes DatadogMeterProvider.shutdown() and needs to follow this change.

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