Azure Monitor exporter does not export metric attributes

[bastbu]

Component(s)

exporter/azuremonitor

What happened?

Description

The Azure Monitor exporter should export metric attributes as customDimensions. Currently it does not export metric attributes (dimensions) to Azure Monitor.

Steps to Reproduce

Run the following sample (slight variation of the getting started section from the OTel .NET docs):

public class Program
{
    private static readonly Meter MyMeter = new("OtelTest", "1.0");
    private static readonly Counter<long> MyFruitCounter = MyMeter.CreateCounter<long>("MyFruitCounter");

    public static void Main()
    {
        using var meterProvider = Sdk.CreateMeterProviderBuilder()
            .AddMeter("OtelTest")
            .AddOtlpExporter()
            .AddConsoleExporter()
            .Build();

        MyFruitCounter.Add(1, new("name", "apple"), new("color", "red"));
    }
}

Expected Result

The console exporter shows the information an expected result could contain:

Resource associated with Metric:
    service.name: unknown_service:oteltest

Export MyFruitCounter, Meter: OtelTest/1.0
(2023-03-08T17:09:25.3912339Z, 2023-03-08T17:09:25.7726745Z] color: red name: apple LongSum
Value: 1

Note the color: red name: apple snippet. Application Insights should contain the same information.

Actual Result

The information about the attributes cannot be found in Application Insights.

Collector version

0.72

Environment information

Environment

OS: WSL on Windows 11

OpenTelemetry Collector configuration

receivers:
  otlp:
    protocols: 
      grpc:
processors:
exporters:
  logging:
  azuremonitor:
    instrumentation_key: <redacted>
service:
  pipelines:
    traces:
      receivers: [otlp]
      processors: []
      exporters: [logging,azuremonitor]
    metrics:
      receivers: [otlp]
      processors: []
      exporters: [logging,azuremonitor]
    logs:
      receivers: [otlp]
      processors: []
      exporters: [logging,azuremonitor]

Log output

No response

Additional context

No response

[github-actions]

Pinging code owners:

• exporter/azuremonitor: @pcwiese

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