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Wire OTel metrics into the four remaining .NET services (acl, domain, event-subscriber, projection-api) exactly as the BFF: ASP.NET Core + HttpClient instrumentation + the built-in System.Runtime meter, exposed at /metrics via the Prometheus AspNetCore exporter (ADR-0024). Prometheus scrapes one job per service; Grafana ships a pre-built 'Request path — golden signals' dashboard (traffic/errors/latency/saturation). A verify-metrics CI step proves the endpoints are scraped end to end.
71 lines
3.2 KiB
C#
71 lines
3.2 KiB
C#
using Microsoft.EntityFrameworkCore;
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using OpenTelemetry.Metrics;
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using OpenTelemetry.Resources;
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using OpenTelemetry.Trace;
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using Projection.ReadModel;
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var builder = WebApplication.CreateBuilder(args);
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// OpenTelemetry tracing (S-16b, ADR-0023): auto-instrument incoming ASP.NET Core requests, exported
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// over OTLP to Tempo, so a BFF → projection-api read is one connected trace. Service name + OTLP
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// endpoint come from OTEL_* env (compose); the exporter no-ops when Tempo is unreachable.
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builder.Services.AddOpenTelemetry()
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.ConfigureResource(r => r.AddService(
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builder.Configuration["OTEL_SERVICE_NAME"] ?? builder.Environment.ApplicationName))
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.WithTracing(tracing => tracing
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.AddAspNetCoreInstrumentation(o => o.Filter = ctx => ctx.Request.Path != "/health")
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.AddHttpClientInstrumentation()
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.AddOtlpExporter())
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// OpenTelemetry metrics (S-16c, ADR-0023): golden signals for the request path —
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// http.server.request.duration (traffic/errors/latency) + http.client.* for downstream hops, plus
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// the built-in System.Runtime meter for saturation (GC, CPU, thread pool). Prometheus scrapes these
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// from /metrics (mapped below); metrics aren't pushed over OTLP, so no collector hop (ADR-0023).
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.WithMetrics(metrics => metrics
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.AddAspNetCoreInstrumentation()
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.AddHttpClientInstrumentation()
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.AddMeter("System.Runtime")
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.AddPrometheusExporter());
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var connectionString = builder.Configuration.GetConnectionString("Projection")
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?? throw new InvalidOperationException("Missing connection string 'ConnectionStrings:Projection'");
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builder.Services.AddProjectionReadModel(connectionString);
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var app = builder.Build();
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// Ensure the schema exists before serving reads. The Event Subscriber migrates this shared DB too;
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// MigrateProjectionAsync serialises concurrent migrators with a session advisory lock so the whole
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// migration sequence runs exactly once (see ServiceCollectionExtensions).
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await app.Services.MigrateProjectionAsync();
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app.MapGet("/health", () => "Healthy");
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// Prometheus scrape endpoint (S-16c): exposes the OTel metrics above in Prometheus text format.
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app.MapPrometheusScrapingEndpoint();
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// The read side of the projection. Public-safe field filtering is tightened in S-09; for now
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// the minimal projection only carries id + status (bsn/naam deferred — ADR-0008).
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app.MapGet("/register", async (ProjectionDbContext db, CancellationToken ct) =>
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{
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var rows = await db.RegisterEntries
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.OrderBy(r => r.Id)
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.Select(r => new RegisterEntryDto(r.Id, r.Status, r.Reference, r.Bsn, r.NaamPlaceholder))
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.ToListAsync(ct);
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return Results.Ok(rows);
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});
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app.MapGet("/register/{id}", async (string id, ProjectionDbContext db, CancellationToken ct) =>
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{
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var row = await db.RegisterEntries
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.Where(r => r.Id == id)
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.Select(r => new RegisterEntryDto(r.Id, r.Status, r.Reference, r.Bsn, r.NaamPlaceholder))
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.SingleOrDefaultAsync(ct);
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return row is null ? Results.NotFound() : Results.Ok(row);
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});
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await app.RunAsync();
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public sealed record RegisterEntryDto(string Id, string Status, string? Reference, string? Bsn, string? NaamPlaceholder);
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public partial class Program;
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