Aspire Dashboard Metrics: Meter tags do not display

[JackRhodes]

Originally posted in the open-telemetry/opentelemetry-dotnet#5669 (comment) but re-directing here:

Aspire dashboard does not show Meter defined Tags in the dashboard

Example code:

// See https://aka.ms/new-console-template for more information

using System.Diagnostics.Metrics;
using OpenTelemetry;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;

using var meter = new Meter("TestMeter", "1.0.0", new[]
{
    new KeyValuePair<string, object?>("namespace", "jacklocaldev")
});

var providerBuilder = Sdk.CreateMeterProviderBuilder()
    .ConfigureResource(r => r.AddService("testservice"))
    .AddMeter(meter.Name); // All instruments from this meter are enabled.

providerBuilder.AddOtlpExporter();

var provider = providerBuilder.Build();

while (true)
{
    await Task.Delay(TimeSpan.FromSeconds(1));
    meter.CreateCounter<int>("foo").Add(1);
}

Aspire Dashboard:

I would be expecting the namespace tag to show.

[JamesNK]

Hi, I tested this out and confirmed what you're seeing. I believe the issue is inside opentelemetry-dotnet. It doesn't send the meter tags so it's impossible for the dashboard to display them.

Here is the issue on the opentelemetry repo: open-telemetry/opentelemetry-dotnet#5478

The only thing we can do is wait for them to fix the issue, release a new version, then update Aspire's package references to the new version.

[cijothomas]

I believe the issue is inside opentelemetry-dotnet. It doesn't send the meter tags

@JamesNK Meter tags are supported in OTLP Exporters. Is the issue only when using Aspire dashboard, or can be repro-ed with OTel Collector?

[JamesNK]

I took a closer look and I see they're reported on the instrument scope. I expected them to be merged into the attributes collection on a data point.

I'll update the UI to combine them.