enrich metrics snippet to project file

aspnetcore/log-mon/metrics/metrics.md

@@ -97,35 +97,7 @@ ASP.NET Core has many built-in metrics. The `http.server.request.duration` metri
 
 The `http.server.request.duration` metric supports tag enrichment using <xref:Microsoft.AspNetCore.Http.Features.IHttpMetricsTagsFeature>. Enrichment is when a library or app adds its own tags to a metric. This is useful if an app wants to add a custom categorization to dashboards or alerts built with metrics.
 
-```cs
-using Microsoft.AspNetCore.Http.Features;
-
-var builder = WebApplication.CreateBuilder();
-var app = builder.Build();
-
-app.Use(async (context, next) =>
-{
-    var tagsFeature = context.Features.Get<IHttpMetricsTagsFeature>();
-    if (tagsFeature != null)
-    {
-        var source = context.Request.Query["utm_medium"].ToString() switch
-        {
-            "" => "none",
-            "social" => "social",
-            "email" => "email",
-            "organic" => "organic",
-            _ => "other"
-        };
-        tagsFeature.Tags.Add(new KeyValuePair<string, object?>("mkt_medium", source));
-    }
-
-    await next.Invoke();
-});
-
-app.MapGet("/", () => "Hello World!");
-
-app.Run();
-```
+:::code language="csharp" source="~/log-mon/metrics/metrics/samples/EnrichMetrics/Program.cs":::
 
 The proceeding example:
 

aspnetcore/log-mon/metrics/metrics/samples/EnrichMetrics/EnrichMetrics.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>

aspnetcore/log-mon/metrics/metrics/samples/EnrichMetrics/Program.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.Http.Features;
+
+var builder = WebApplication.CreateBuilder();
+var app = builder.Build();
+
+app.Use(async (context, next) =>
+{
+    var tagsFeature = context.Features.Get<IHttpMetricsTagsFeature>();
+    if (tagsFeature != null)
+    {
+        var source = context.Request.Query["utm_medium"].ToString() switch
+        {
+            "" => "none",
+            "social" => "social",
+            "email" => "email",
+            "organic" => "organic",
+            _ => "other"
+        };
+        tagsFeature.Tags.Add(new KeyValuePair<string, object?>("mkt_medium", source));
+    }
+
+    await next.Invoke();
+});
+
+app.MapGet("/", () => "Hello World!");
+
+app.Run();

aspnetcore/log-mon/metrics/metrics/samples/EnrichMetrics/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}