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feat(obs): OpenTelemetry distributed tracing across the five .NET services (refs #123)

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Each host adds AddOpenTelemetry().WithTracing with ASP.NET Core + HttpClient
auto-instrumentation and an OTLP exporter to Tempo; service name + endpoint from
OTEL_* env set per app service in compose. Since every cross-service call goes
through a typed HttpClient, traceparent propagates for free, so a request is one
connected trace (bff → domain/projection → acl → openzaak). /health is filtered
out. The exporter no-ops harmlessly when Tempo is unreachable (verified: domain
boots healthy with no collector).

refs #123
This commit is contained in:
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2026-07-23 14:35:47 +02:00
parent b32c352f20
commit 271c54197e
11 changed files with 117 additions and 0 deletions
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services/event-subscriber/EventSubscriber.Api/EventSubscriber.Api.csproj
+7
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@@ -5,6 +5,13 @@
<ProjectReference Include="..\..\projection-api\Projection.ReadModel\Projection.ReadModel.csproj" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.17.0" />
<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.17.0" />
<PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.17.0" />
<PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.17.0" />
</ItemGroup>
<PropertyGroup>
<TargetFramework>net10.0</TargetFramework>
<Nullable>enable</Nullable>
services/event-subscriber/EventSubscriber.Api/Program.cs
+13
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@@ -1,9 +1,22 @@
using System.Text.Json;
using EventSubscriber.Application;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
using Projection.ReadModel;
var builder = WebApplication.CreateBuilder(args);
// OpenTelemetry tracing (S-16b, ADR-0023): auto-instrument the incoming NRC notification callback and
// the outgoing ACL enrichment call, exported over OTLP to Tempo. Service name + OTLP endpoint come
// from OTEL_* env (compose); the exporter no-ops when Tempo is unreachable.
builder.Services.AddOpenTelemetry()
.ConfigureResource(r => r.AddService(
builder.Configuration["OTEL_SERVICE_NAME"] ?? builder.Environment.ApplicationName))
.WithTracing(tracing => tracing
.AddAspNetCoreInstrumentation(o => o.Filter = ctx => ctx.Request.Path != "/health")
.AddHttpClientInstrumentation()
.AddOtlpExporter());
var connectionString = builder.Configuration.GetConnectionString("Projection")
?? throw new InvalidOperationException("Missing connection string 'ConnectionStrings:Projection'");
// The exact Authorization header value Open Notificaties sends on each abonnement callback.