Instrument tags not attached

[YarinOmesi]

What are you trying to achieve?

System.Diagnostics.DiagnosticSource v8.0 introduced the ability to instantiate an insrument with tags. for example Counter with tags.

Using System.Diagnostics.DiagnosticSource v8.0, when creating and exporting a counter with tags, I expect tags declared in an instrument will be attached and be exported (in prometheus).

Example Code:

Meter meter = new Meter("MyMeter", "1.0");

TagList counterTags = new TagList() {
    {"counter_tag", true}
};

Counter<long> myCounter = meter.CreateCounter<long>("myCounter", null, null, counterTags);

MeterProvider meterProvider = Sdk.CreateMeterProviderBuilder()
    .AddMeter("MyMeter")
    .AddConsoleExporter()
    .AddPrometheusHttpListener(options => options.UriPrefixes = new []{"http://localhost:9000"})
    .Build();

myCounter.Add(1);

meterProvider.Dispose();

What did you expect to see?

I expect tags declared in an instrument will be attached and be exported (in prometheus).

Actual output, without the instrument tags

# TYPE myCounter_total counter
myCounter_total 1 1706978095318

# EOF

Additional context.

Discussed In #5313

Relevant docs:
https://github.com/open-telemetry/opentelemetry-dotnet/tree/main/docs/metrics#metrics-enrichment

[trask]

hi @YarinOmesi! can you describe the change you would like to see in terms of the specification (instead of in terms of .Net)?

cc @open-telemetry/dotnet-approvers

[cijothomas]

hi @YarinOmesi! can you describe the change you would like to see in terms of the specification (instead of in terms of .Net)?

cc @open-telemetry/dotnet-approvers

It looks like some miscommunicated! I did ask to open a new issue to track this, but I meant to open one on the otel .net repo!

Transferring issue to otel .net repo.