save progress

src/Scanner/StellaOps.Scanner.WebService/Endpoints/ObservabilityEndpoints.cs

@@ -0,0 +1,26 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Routing;
+using StellaOps.Scanner.WebService.Services;
+
+namespace StellaOps.Scanner.WebService.Endpoints;
+
+internal static class ObservabilityEndpoints
+{
+    public static void MapObservabilityEndpoints(this IEndpointRouteBuilder endpoints)
+    {
+        ArgumentNullException.ThrowIfNull(endpoints);
+
+        endpoints.MapGet("/metrics", HandleMetricsAsync)
+            .WithName("scanner.metrics")
+            .Produces(StatusCodes.Status200OK);
+    }
+
+    private static IResult HandleMetricsAsync(OfflineKitMetricsStore metricsStore)
+    {
+        ArgumentNullException.ThrowIfNull(metricsStore);
+
+        var payload = metricsStore.RenderPrometheus();
+        return Results.Text(payload, contentType: "text/plain; version=0.0.4; charset=utf-8");
+    }
+}
+