Current implementation pattern for ExportMetrics

[andrewang-canva]

Hi there,

I want to export metrics emitted by ExportMetrics

Wondering what is current approved implementation for ExportMetrics via OpenTelemetrySdk? Currently we are leveraging on the sdk via the following:

var exporter = OtlpGrpcMetricExporter.builder()
        .setEndpoint("http://localhost:4317")
        .build();

var reader = PeriodicMetricReader.builder(exporter)
    .setInterval(Duration.ofSeconds(10)).build();

SdkMeterProviderUtil.registerMetricReaderWithCardinalitySelector(
    sdkMeterProviderBuilder, reader, unused -> 100_000);

sdkMeterProviderBuilder.registerView(
    InstrumentSelector.builder().setMeterName("ExponentialHistogram").build(),
      View.builder().setAggregation(Aggregation.base2ExponentialBucketHistogram()).build());

var sdkMeterProvider = sdkMeterProviderBuilder.build();

openTelemetrySdkClient = OpenTelemetrySdk.builder()
    .setMeterProvider(sdkMeterProvider)
    .build();

Cheers

[jack-berg]

That looks about right to me.

A few notes about ExporterMetrics:

• The metrics produced by this are not stable and will see breaking changes at some point in the future.
• ExporterMetrics is used for OtlpHttpSpanExporter, OtlpGrpcSpanExporter, OtlpHttpLogRecordExporter, OtlpGrpcLogRecordExporter, and ZipkinSpanExproter. It is not used for OtlpHttpMetricExporter or OtlpGrpcMetricExporter - there are currently no metrics for tracking metric export.
• ExporterMetrics will be enabled by default if you use opentelemetry-sdk-extension-autoconfigure, but if you're programmatically configuring the SDK like in your example, you need to make sure you register your SdkMeterProvider with your exporters. For example, to enable ExporterMetrics for OtlpHttpSpanExporter, call OtlpHttpSpanExporterBuilder#setMeterProvider(sdkMeterProvider). This requires careful ordering during initialization, since SdkMeterProvider needs to be initialized before SdkLoggerProvider / SdkTracerProvider.

[andrewang-canva]

Thanks @jack-berg, I was not aware that ExportMetrics is not available for tracking metric export which is what i'm looking for in my application. If that's the case, are there any other internal metrics that we can leverage on?