Publish curated Knowledge Hub source from 2ed833f290b439a7bc91e5fd19b042c269e3bee9

tests/backend/ItWorx.KnowledgeHub.IntegrationTests/Operations/OtlpExportTests.cs

@@ -0,0 +1,54 @@
+using System.Diagnostics.Metrics;
+using System.Net;
+using System.Text;
+using ItWorx.KnowledgeHub.Application.Operations;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Hosting.Server;
+using Microsoft.AspNetCore.Hosting.Server.Features;
+using Microsoft.Extensions.DependencyInjection;
+using OpenTelemetry;
+using OpenTelemetry.Exporter;
+using OpenTelemetry.Metrics;
+
+namespace ItWorx.KnowledgeHub.IntegrationTests.Operations;
+
+public sealed class OtlpExportTests
+{
+    [Fact]
+    public async Task Platform_metrics_are_exported_over_real_OTLP_HTTP_without_private_labels()
+    {
+        var received = new TaskCompletionSource<byte[]>(TaskCreationOptions.RunContinuationsAsynchronously);
+        var builder = WebApplication.CreateSlimBuilder();
+        builder.WebHost.ConfigureKestrel(server => server.Listen(IPAddress.Loopback, 0));
+        await using var collector = builder.Build();
+        collector.MapPost("/v1/metrics", async context =>
+        {
+            using var body = new MemoryStream();
+            await context.Request.Body.CopyToAsync(body);
+            received.TrySetResult(body.ToArray());
+            context.Response.ContentType = "application/x-protobuf";
+            context.Response.StatusCode = 200;
+        });
+        await collector.StartAsync();
+        var address = collector.Services.GetRequiredService<IServer>()
+            .Features.Get<IServerAddressesFeature>()!.Addresses.Single();
+        using var metrics = new PlatformMetrics();
+        using var provider = Sdk.CreateMeterProviderBuilder().AddMeter("ItWorx.KnowledgeHub.Platform")
+            .AddOtlpExporter(options =>
+            {
+                options.Endpoint = new Uri(new Uri(address), "/v1/metrics");
+                options.Protocol = OtlpExportProtocol.HttpProtobuf;
+            }).Build();
+        metrics.Record("private-document-title", "secret-token", .125, 2);
+        metrics.SetQueueState(2, 1, 0, 90);
+        metrics.SetOperationalAges(30, 60, 120);
+        Assert.True(provider.ForceFlush(10_000));
+        var payload = Encoding.UTF8.GetString(await received.Task.WaitAsync(TimeSpan.FromSeconds(10)));
+        Assert.Contains("platform_operations_total", payload, StringComparison.Ordinal);
+        Assert.Contains("platform_evidence_age_seconds", payload, StringComparison.Ordinal);
+        Assert.DoesNotContain("private-document-title", payload, StringComparison.Ordinal);
+        Assert.DoesNotContain("secret-token", payload, StringComparison.Ordinal);
+        await collector.StopAsync();
+    }
+}