Exported Int64ValueRecorder Metrics Via OTLP Missing Labels

[terev]

Version: v0.16.0
Collector Version: v0.20.0

When exporting a metric via the OTLP exporter pointed at a grpc receiver in a collector. The exported metric has none of my defined labels.

metric setup:

driver := otlpgrpc.NewDriver(
  otlpgrpc.WithInsecure(),
  otlpgrpc.WithEndpoint(c.Metrics.OtelURL),
)
exporter, err := otlp.NewExporter(context.Background(), driver)
if err != nil {
  return nil, errors.Wrap(err, "failed to create exporter")
}

cont := controller.New(
  processor.New(
	  simple.NewWithExactDistribution(),
	  exporter,
  ),
  controller.WithPusher(exporter),
  controller.WithCollectPeriod(2*time.Second),
)

otel.SetMeterProvider(cont.MeterProvider())

if err := cont.Start(context.Background()); err != nil {
  return nil, err
}

return func() {
  err := cont.Stop(context.Background()) // Push any last metric events to the exporter.
  if err != nil {
	  panic(err)
  }
  exporter.Shutdown(context.Background())
}, nil

recorder, err := meter.NewInt64ValueRecorder(
  "container_image_size_bytes",
  metric.WithUnit(unit.Bytes),
  metric.WithDescription("Records uncompressed built image size"),
)
recorder.Record(ctx, size, label.Any("yo", "yo"), containerImageName.String(name), containerImageRegistry.String(registry))

I was able to hook up a debugger and trace the library to find the metric is being transformed to a gauge array https://github.com/open-telemetry/opentelemetry-go/blob/main/exporters/otlp/internal/transform/metric.go#L309 . Which makes sense but for some reason the labels on each data point are currently being set to nil. Is this a misake?

[terev]

I tried passing stringKeyValues(labels.Iter()) instead of nil and my labels end up being exported correctly. Is there a reason the labels aren't being passed?