I am using OpenTelemetry’s Metrics to get information about my environment.

I have several tenants that will use OpenTelemetry and will all be ingested into Prometheus and then Grafana.

I would like to differentiate between each one by adding some king of label/tag/attribute.

I am using the configuration below, but when I expose the /metrics endpoint using the UseOpenTelemetryPrometheusScrapingEndpoint extension method, the attribute is not shown.

    services.AddOpenTelemetry()
        .WithMetrics(opts =>
        {
            opts.ConfigureResource(resourceBuilder =>
                {
                    resourceBuilder.AddTelemetrySdk();
                    resourceBuilder.AddService(serviceName: "tenant_service_config");
                    resourceBuilder.AddAttributes(new Dictionary<string, object> { ["tenant_id"] = 2 });
                })
                .AddMeter(meters.MetricName)
                .AddAspNetCoreInstrumentation()
                .AddProcessInstrumentation()
                .AddRuntimeInstrumentation();

However, if I manually create a Metric and add a tag, it does show up in the /metrics endpoint

_userLoginCounter.Add(1, new KeyValuePair<string, object>("tenant.id", tenantId));