Lower reference to Microsoft.Extensions.Diagnostics.Abstractions.

Directory.Packages.props

@@ -29,7 +29,7 @@
 
     <PackageVersion Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Diagnostics" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.Diagnostics.Abstractions" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Configuration" Version="8.0.0" />

src/OpenTelemetry.Extensions.Hosting/OpenTelemetry.Extensions.Hosting.csproj

@@ -10,7 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" />
-    <PackageReference Include="Microsoft.Extensions.Diagnostics" />
+    <PackageReference Include="Microsoft.Extensions.Diagnostics.Abstractions" />
   </ItemGroup>
 
   <ItemGroup>

src/OpenTelemetry.Extensions.Hosting/OpenTelemetryBuilder.cs

@@ -82,10 +82,9 @@ public OpenTelemetryBuilder ConfigureResource(
     /// <item>This is safe to be called multiple times and by library authors.
     /// Only a single <see cref="MeterProvider"/> will be created for a given
     /// <see cref="IServiceCollection"/>.</item>
-    /// <item>This method automatically calls <see
-    /// cref="MetricsServiceExtensions.AddMetrics(IServiceCollection)"/> and
-    /// registers an <see cref="IMetricsListener"/> named 'OpenTelemetry' into
-    /// the <see cref="IServiceCollection"/>.</item>
+    /// <item>This method automatically registers an <see
+    /// cref="IMetricsListener"/> named 'OpenTelemetry' into the <see
+    /// cref="IServiceCollection"/>.</item>
     /// </list>
     /// </remarks>
     /// <returns>The supplied <see cref="OpenTelemetryBuilder"/> for chaining
@@ -103,8 +102,9 @@ public OpenTelemetryBuilder WithMetrics()
     /// calls.</returns>
     public OpenTelemetryBuilder WithMetrics(Action<MeterProviderBuilder> configure)
     {
-        this.Services.AddMetrics(
-            builder => builder.UseOpenTelemetry(configure));
+        OpenTelemetryMetricsBuilderExtensions.RegisterMetricsListener(
+            this.Services,
+            configure);
 
         return this;
     }

src/OpenTelemetry.Extensions.Hosting/OpenTelemetryMetricsBuilderExtensions.cs

@@ -14,6 +14,7 @@
 // limitations under the License.
 // </copyright>
 
+using System.Diagnostics;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using OpenTelemetry.Internal;
@@ -56,15 +57,25 @@
         Action<MeterProviderBuilder> configure)
     {
         Guard.ThrowIfNull(metricsBuilder);
+
+        RegisterMetricsListener(metricsBuilder.Services, configure);
+
+        return metricsBuilder;
+    }
+
+    internal static void RegisterMetricsListener(
+        IServiceCollection services,
+        Action<MeterProviderBuilder> configure)
+    {
+        Debug.Assert(services != null, "services was null");
+
         Guard.ThrowIfNull(configure);
 
-        var builder = new MeterProviderBuilderBase(metricsBuilder.Services);
+        var builder = new MeterProviderBuilderBase(services);
 
-        metricsBuilder.Services.TryAddEnumerable(
+        services.TryAddEnumerable(
             ServiceDescriptor.Singleton<IMetricsListener, OpenTelemetryMetricsListener>());
 
         configure(builder);
-
-        return metricsBuilder;
     }
 }