How to Connect Grafana Tempo to Dotnet App ?

[RedEye-Developers]

using OpenTelemetry;
using OpenTelemetry.Exporter;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
builder.Services.AddOpenApi();

builder.Services.AddOpenTelemetry()
    .WithTracing(trace =>
    {
        trace.SetResourceBuilder(ResourceBuilder.CreateDefault().AddService("Observability-Traces"));

        trace.AddAspNetCoreInstrumentation()
            .AddConsoleExporter();

        trace.SetSampler(new AlwaysOnSampler());

        trace.AddOtlpExporter(x =>
        {
            x.Endpoint = new Uri("http://localhost:3100");
            x.Protocol = OtlpExportProtocol.HttpProtobuf;
        });
    });

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.MapOpenApi();
}

app.UseHttpsRedirection();

var summaries = new[]
{
    "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};

app.MapGet("/weatherforecast", () =>
    {
        var forecast = Enumerable.Range(1, 5).Select(index =>
                new WeatherForecast
                (
                    DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
                    Random.Shared.Next(-20, 55),
                    summaries[Random.Shared.Next(summaries.Length)]
                ))
            .ToArray();
        return forecast;
    })
    .WithName("GetWeatherForecast");

app.Run();

record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
{
    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
}

server:
  http_listen_port: 3200

distributor:
  receivers:
      otlp:
        protocols:
          http:
            endpoint: "0.0.0.0:3100"

compactor:
  compaction:
    block_retention: 2

storage:
  trace:
    backend: local
    wal:
      path: C:\Users\Administrator\Downloads\tempo
    local:
      path: C:\Users\Administrator\Downloads\tempo

i try like this it is not working.

tempo_2.8.2_windows_amd64.tar.gz

i wand using this windows tempo.

[RedEye-Developers]

if i do something in grafana dashboard that logs all showing in tempo console, if i call the dotnet minimal api endpoint multiple times the trace collecting logs noting showing in tempo console but in dotnet console the trace collecting logs all showing properly.

Activity.TraceId:            4462ad60d09cfceb3b50f7c09b460abd
Activity.SpanId:             96fc14933b8186ff
Activity.TraceFlags:         Recorded
Activity.DisplayName:        GET /weatherforecast
Activity.Kind:               Server
Activity.StartTime:          2025-09-30T14:53:37.3459499Z
Activity.Duration:           00:00:00.0001402
Activity.Tags:
    server.address: localhost
    server.port: 5000
    http.request.method: GET
    url.scheme: http
    url.path: /weatherforecast
    network.protocol.version: 1.1
    user_agent.original: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36
    http.route: /weatherforecast
    http.response.status_code: 200
Instrumentation scope (ActivitySource):
    Name: Microsoft.AspNetCore
Resource associated with Activity:
    service.name: Observability-Traces
    service.instance.id: 65d7a69b-bf7a-4e8a-a81a-01abb2f054fd
    telemetry.sdk.name: opentelemetry
    telemetry.sdk.language: dotnet
    telemetry.sdk.version: 1.12.0

[joe-elliott]

Perhaps trying walking through ingestion debugging?

https://grafana.com/docs/tempo/latest/troubleshooting/querying/unable-to-see-trace/#section-1-diagnose-and-fix-ingestion-issues

Check all components for relevant logs and confirm there is expected network connectivity.