Maple .NET / C# style

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

using OpenTelemetry;
using OpenTelemetry.Exporter;
using OpenTelemetry.Logs;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

const string MapleEndpoint = "https://ingest.maple.dev"; // EU: https://ingest.eu.maple.dev
const string MapleKey = "MAPLE_TEST"; // public ingest key (maple_pk_…), or MAPLE_TEST until the user has one

var builder = WebApplication.CreateBuilder(args);

void ConfigureOtlp(OtlpExporterOptions options, string path)
{
    options.Endpoint = new Uri($"{MapleEndpoint}/v1/{path}");
    options.Protocol = OtlpExportProtocol.HttpProtobuf;
    options.Headers = $"authorization=Bearer {MapleKey}";
}

builder.Services.AddOpenTelemetry()
    .ConfigureResource(r => r
        .AddService("orders-api")
        .AddAttributes(new Dictionary<string, object>
        {
            ["deployment.environment.name"] = builder.Environment.EnvironmentName,
            ["vcs.repository.url.full"] = "https://github.com/acme/orders-api",
            ["vcs.ref.head.revision"] = Environment.GetEnvironmentVariable("GITHUB_SHA") ?? "",
        }))
    .WithTracing(tracing => tracing
        .AddSource("orders.api") // every custom ActivitySource name, or its spans are dropped
        .AddAspNetCoreInstrumentation()
        .AddHttpClientInstrumentation()
        .AddOtlpExporter(o => ConfigureOtlp(o, "traces")))
    .WithMetrics(metrics => metrics
        .AddAspNetCoreInstrumentation()
        .AddHttpClientInstrumentation()
        .AddOtlpExporter(o => ConfigureOtlp(o, "metrics")))
    .WithLogging(
        logging => logging.AddOtlpExporter(o => ConfigureOtlp(o, "logs")),
        options =>
        {
            options.IncludeFormattedMessage = true;
            options.IncludeScopes = true;
        });

var app = builder.Build();

public static class Tracing
{
    public static readonly ActivitySource Source = new("orders.api");
}

public sealed class OrderService
{
    public async Task SubmitAsync(string orderId, string tenantId)
    {
        using var activity = Tracing.Source.StartActivity("order.submit");
        activity?.SetTag("tenant.id", tenantId);
        activity?.SetTag("order.id", orderId);
        try
        {
            await ChargeAsync(orderId);
        }
        catch (Exception ex)
        {
            activity?.RecordException(ex);
            activity?.SetStatus(ActivityStatusCode.Error, ex.Message);
            throw;
        }
    }
}