feat: or-2013 add initiator to otel tracing via middleware

src/AssociationRegistry.Admin.Api/Infrastructure/Middleware/InitiatorActivityMiddleware.cs

@@ -0,0 +1,28 @@
+namespace AssociationRegistry.Admin.Api.Infrastructure.Middleware;
+
+using Microsoft.AspNetCore.Http;
+using System.Diagnostics;
+using System.Threading.Tasks;
+
+public class InitiatorActivityMiddleware
+{
+    private readonly RequestDelegate _next;
+
+    public InitiatorActivityMiddleware(RequestDelegate next)
+    {
+        _next = next;
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        if (context.Request.Headers.TryGetValue(WellknownHeaderNames.Initiator, out var headerValue))
+        {
+            var currentActivity = Activity.Current;
+            if (currentActivity != null)
+            {
+                currentActivity.SetTag("vr.initiator", headerValue.ToString());
+            }
+        }
+        await _next(context);
+    }
+}

src/AssociationRegistry.Admin.Api/Program.cs

@@ -278,6 +278,7 @@ private static void ConfigureMiddleware(IApplicationBuilder app)
                 })
            .UseMiddleware<UnexpectedAggregateVersionMiddleware>()
            .UseMiddleware<InitiatorHeaderMiddleware>()
+           .UseMiddleware<InitiatorActivityMiddleware>()
            .UseResponseCompression();
     }