.NET / C#

dotnet add package OpenTelemetry.Exporter.OpenTelemetryProtocol
dotnet add package OpenTelemetry.Extensions.Hosting
dotnet add package OpenTelemetry.Instrumentation.AspNetCore
dotnet add package OpenTelemetry.Instrumentation.Http

// Program.cs
using OpenTelemetry.Trace;
using OpenTelemetry.Logs;
using OpenTelemetry.Resources;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddOpenTelemetry()
    .ConfigureResource(r => r.AddService("my-dotnet-service"))
    .WithTracing(t => t
        .AddAspNetCoreInstrumentation()
        .AddHttpClientInstrumentation()
        .AddOtlpExporter(o =>
        {
            o.Endpoint = new Uri("https://ingest.squasher.ai");
            o.Headers = "x-squasher-key=sq_pk_your_api_key";
        }))
    .WithLogging(l => l
        .AddOtlpExporter(o =>
        {
            o.Endpoint = new Uri("https://ingest.squasher.ai");
            o.Headers = "x-squasher-key=sq_pk_your_api_key";
        }));

dotnet run

using System.Net.Http.Json;

public class SquasherClient
{
    private static readonly HttpClient _client = new();
    private const string Endpoint = "https://ingest.squasher.ai/v1/ingest/YOUR_PROJECT_ID";
    private const string ApiKey = "sq_pk_your_api_key";

    public static async Task CaptureErrorAsync(Exception ex, Dictionary<string, string>? tags = null)
    {
        var payload = new
        {
            message = ex.Message,
            type = ex.GetType().Name,
            level = "error",
            stack = ex.StackTrace,
            environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "production",
            tags = tags,
        };

        var request = new HttpRequestMessage(HttpMethod.Post, Endpoint)
        {
            Content = JsonContent.Create(payload),
        };
        request.Headers.Add("x-squasher-key", ApiKey);

        await _client.SendAsync(request);
    }
}

try
{
    await ProcessOrderAsync(order);
}
catch (Exception ex)
{
    await SquasherClient.CaptureErrorAsync(ex, new() { ["orderId"] = order.Id });
    throw;
}

For .NET, prefer OpenTelemetry instrumentation for ASP.NET Core and HttpClient. Keep the Squasher key in configuration, set a service name, verify one exception, and use direct HTTP only when OTel is not practical.