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Update metrics.md (#30663) 

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@ -4,7 +4,7 @@ description: Metrics for ASP.NET Core apps
author: rick-anderson
ms.author: riande
monikerRange: '>= aspnetcore-8.0'
ms.date: 6/30/2023
ms.date: 7/30/2023
ms.topic: article
ms.prod: aspnet-core
uid: log-mon/metrics/metrics
@ -226,14 +226,15 @@ Alternatively, enter counter category such as `kestrel` in the **Expression** in
## Test metrics in ASP.NET Core apps
It's possible to test metrics in ASP.NET Core apps. One way to do that is collect and assert metrics values in [ASP.NET Core integration tests](xref:test/integration-tests) using <xref:Microsoft.Extensions.Telemetry.Testing.Metering.MetricCollector%601>.
It's possible to test metrics in ASP.NET Core apps. One way to do that is collect and assert metrics values in [ASP.NET Core integration tests](xref:test/integration-tests) using <!--<xref:Microsoft.Extensions.Telemetry.Testing.Metering.MetricCollector%601>--> [MetricCollector](https://learn.microsoft.com/dotnet/api/microsoft.extensions.telemetry.testing.metering.metriccollector-1?view=dotnet-plat-ext-8.0).
:::code language="csharp" source="~/log-mon/metrics/metrics/samples/metric-tests/BasicTests.cs" id="snippet_TestClass":::
The proceeding test:
* Bootstraps a web app in memory with <xref:Microsoft.AspNetCore.Mvc.Testing.WebApplicationFactory%601>. `Program` in the factory's generic argument specifies the web app.
* Collects metrics values with <xref:Microsoft.Extensions.Telemetry.Testing.Metering.MetricCollector%601>.
* Collects metrics values with <!--<xref:Microsoft.Extensions.Telemetry.Testing.Metering.MetricCollector%601>--> [MetricCollector](https://learn.microsoft.com/dotnet/api/microsoft.extensions.telemetry.testing.metering.metriccollector-1?view=dotnet-plat-ext-8.0).
* Requires a package reference to `Microsoft.Extensions.Telemetry.Testing`.
* The `MetricCollector<T>` is created using the web app's <xref:System.Diagnostics.Metrics.IMeterFactory>. This allows the collector to only report metrics values recorded by test.
* Includes the meter name, `Microsoft.AspNetCore.Hosting`, and counter name, `http.server.request.duration` to collect.