Does MeterProvider support OTLP HttpExporter?

[zakimaksyutov]

Question

I'm trying to emit metrics using OTLP HttpExporter (ConsoleExporter works) but nothing is getting sent. I wonder whether HttpExporter is supported for Metrics path?

  <ItemGroup>
    <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.2.0-beta1" />
    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.2.0-beta1" />
  </ItemGroup>

private static readonly Meter MyMeter = new Meter("ConsoleWithOTel.Meters", "1.0");
private static readonly Counter<long> IncomingRequestsCounter = MyMeter.CreateCounter<long>("IncomingRequests");

private static async Task Main(string[] args)
{
    using var meterProvider = Sdk.CreateMeterProviderBuilder()
        .AddMeter("ConsoleWithOTel.Meters")
        //.AddConsoleExporter(options => { options.MetricExportIntervalMilliseconds = 1000; })
        .AddOtlpExporter(opt =>
        {
            opt.MetricExportIntervalMilliseconds = 1000;
            opt.Endpoint = new Uri("https://bla.com/v1/metrics");
            opt.ExportProcessorType = ExportProcessorType.Simple; // tried Batch as well
            opt.Protocol = OtlpExportProtocol.HttpProtobuf; // Is this option supported?
        })
        .Build();

    IncomingRequestsCounter.Add(1, new KeyValuePair<string, object>("version", "v1"));
    IncomingRequestsCounter.Add(1, new KeyValuePair<string, object>("version", "v1"));
    IncomingRequestsCounter.Add(1, new KeyValuePair<string, object>("version", "v1"));
    IncomingRequestsCounter.Add(1, new KeyValuePair<string, object>("version", "v2"));
    IncomingRequestsCounter.Add(1, new KeyValuePair<string, object>("version", "v3"));
            
    Console.WriteLine($"{DateTimeOffset.UtcNow:O} Press any key to stop...");
    Console.ReadKey();
}

[cijothomas]

opt.Protocol = OtlpExportProtocol.HttpProtobuf; // Is this option supported?

Not for metrics.

[zakimaksyutov]

Thank you! Is the vision that eventually it should be supported? If yes - wonder whether it is already on a roadmap?

[cijothomas]

Thank you! Is the vision that eventually it should be supported? If yes - wonder whether it is already on a roadmap?

Eventually yes. It's not planned for 1.2 stable release but @alanwest might know if the feature is small and can be included in the 1.2 release timeframe.

[alanwest]

Yes, I think this is doable in the 1.2 release timeframe. @rypdal did great work establishing the pattern for traces. Should not be too difficult to apply to both metrics and logs. @rypdal did you have any plans to do this? If not, this is something I could pick up soon.

[rypdal]

On the 2nd of November (Tu.) there will be some internal company's planning / sync session. After that I can say if can pick it up. I can let you know during the next "OpenTelemetry .NET SDK SIG sync up" (also the 2nd of November). But if it's more urgent then @alanwest can pick it up as well. Theoretically implementation of metrics/logs export should be rather straightforward. Just one thing. It makes sense to merge the #2492 Otlp http exporter: allow endpoint override first.

[cijothomas]

Tagging with metrics, enhancement labels. Not marking as "required-for-ga" for Metrics, as this is not a blocker for 1.2 Metric release (OTLP+grpc alone is sufficient for that).

In other words, this'd be nice to have for 1.2, and may land in 1.2, but not required/won't block 1.2.

[greaterthanmost]

@cijothomas Has it been confirmed whether or not the Http protocol will be included in the 1.2 release yet?

[rypdal]

I can add from my side that, unfortunately, there are some internal company's things popped up in the latest time and there is no possibility to make this contribution for me at the moment.

[greaterthanmost]

I can add from my side that, unfortunately, there are some internal company's things popped up in the latest time and there is no possibility to make this contribution for me at the moment.

Okay cool. Thank you for the update.