Added entry to breadcrumb toc

Author: wadepickett

Diff for: docs/breadcrumb/toc.yml

@@ -38,7 +38,7 @@ items:
               - name: Unmanaged API reference
                 tocHref: /dotnet/framework/unmanaged-api/
                 topicHref: /dotnet/framework/unmanaged-api/
-          - name: .NET architecture
+          - name: .NET architecture 
             tocHref: /dotnet/architecture/
             topicHref: /dotnet/architecture/index
             items:
@@ -57,3 +57,6 @@ items:
               - name: Enterprise Application Patterns Using .NET MAUI
                 tocHref: /dotnet/architecture/maui/
                 topicHref: /dotnet/architecture/maui/index
+              - name: ASP.NET Core metrics
+                tocHref: /aspnet/core/log-mon/metrics/built-in
+                topicHref: /aspnet/core/log-mon/metrics/built-in