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Metrics APIs Additions (#86567)
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‎src/libraries/Common/src/System/Diagnostics/DiagnosticsHelper.cs

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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using System.Collections.Generic;
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namespace System.Diagnostics
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{
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internal static class DiagnosticsHelper
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{
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internal static bool CompareTags(IEnumerable<KeyValuePair<string, object?>>? tags1, IEnumerable<KeyValuePair<string, object?>>? tags2)
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{
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if (tags1 == tags2)
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{
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return true;
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}
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if (tags1 is null || tags2 is null)
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{
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return false;
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}
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if (tags1 is ICollection<KeyValuePair<string, object?>> firstCol && tags2 is ICollection<KeyValuePair<string, object?>> secondCol)
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{
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int count = firstCol.Count;
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if (count != secondCol.Count)
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{
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return false;
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}
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if (firstCol is IList<KeyValuePair<string, object?>> firstList && secondCol is IList<KeyValuePair<string, object?>> secondList)
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{
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for (int i = 0; i < count; i++)
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{
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KeyValuePair<string, object?> pair1 = firstList[i];
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KeyValuePair<string, object?> pair2 = secondList[i];
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if (pair1.Key != pair2.Key || !object.Equals(pair1.Value, pair2.Value))
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{
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return false;
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}
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}
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return true;
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}
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}
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using (IEnumerator<KeyValuePair<string, object?>> e1 = tags1.GetEnumerator())
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using (IEnumerator<KeyValuePair<string, object?>> e2 = tags2.GetEnumerator())
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{
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while (e1.MoveNext())
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{
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KeyValuePair<string, object?> pair1 = e1.Current;
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if (!e2.MoveNext())
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{
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return false;
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}
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KeyValuePair<string, object?> pair2 = e2.Current;
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if (pair1.Key != pair2.Key || !object.Equals(pair1.Value, pair2.Value))
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{
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return false;
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}
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}
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return !e2.MoveNext();
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}
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}
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}
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}

‎src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/Microsoft.Extensions.Diagnostics.Abstractions.sln

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{5C580568-6072-4F27-B5C6-FA04556E3B98} = {5725D7DF-DC33-47D2-90C9-D8736C579E77}
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‎src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/README.md

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# Microsoft.Extensions.Diagnostics.Abstractions
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`Microsoft.Extensions.Diagnostics.Abstractions` includes the various abstraction types for telemetry, such as IMeterFactory.
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Commonly Used Types:
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- Microsoft.Extensions.Metrics.IMeterFactory
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## Contribution Bar
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- [x] [We consider new features, new APIs, bug fixes, and performance changes](https://github.com/dotnet/runtime/tree/main/src/libraries#contribution-bar)
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The APIs and functionality are mature, but do get extended occasionally.
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## Deployment
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[Microsoft.Extensions.Diagnostics.Abstractions](https://www.nuget.org/packages/Microsoft.Extensions.Diagnostics.Abstractions) is included in the ASP.NET Core shared framework. The package is deployed as out-of-band (OOB) too and can be referenced into projects directly.

‎src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/ref/Microsoft.Extensions.Diagnostics.Abstractions.cs

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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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namespace Microsoft.Extensions.Diagnostics.Metrics
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{
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public interface IMeterFactory : System.IDisposable
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{
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System.Diagnostics.Metrics.Meter Create(System.Diagnostics.Metrics.MeterOptions options);
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}
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}

‎src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/ref/Microsoft.Extensions.Diagnostics.Abstractions.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<ItemGroup>
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<Compile Include="Microsoft.Extensions.Diagnostics.Abstractions.cs" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="$(LibrariesProjectRoot)System.Diagnostics.DiagnosticSource\ref\System.Diagnostics.DiagnosticSource.csproj" />
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‎src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/src/Metrics/IMeterFactory.cs

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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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using System;
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using System.Diagnostics.Metrics;
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namespace Microsoft.Extensions.Diagnostics.Metrics
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{
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/// <summary>
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/// A factory for creating <see cref="Meter"/> instances.
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/// </summary>
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/// <remarks>
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/// Meter factories will be accountable for the following responsibilities:
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/// - Creating a new meter.
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/// - Attaching the factory instance as a scope to the Meter constructor for all created Meter objects.
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/// - Storing created meters in a cache and returning a cached instance if a meter with the same parameters (name, version, and tags) is requested.
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/// - Disposing of all cached Meter objects upon factory disposal.
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/// </remarks>
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public interface IMeterFactory : IDisposable
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{
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/// <summary>
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/// Creates a new <see cref="Meter"/> instance.
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/// </summary>
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/// <param name="options">The <see cref="MeterOptions"/> to use when creating the meter.</param>
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/// <returns>A new <see cref="Meter"/> instance.</returns>
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/// <remarks>
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/// The <see cref="Meter"/> instance returned by this method should be cached by the factory and returned for subsequent requests for a meter with the same parameters (name, version, and tags).
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/// </remarks>
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Meter Create(MeterOptions options);
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}
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}

‎src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/src/Microsoft.Extensions.Diagnostics.Abstractions.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
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<EnableDefaultItems>true</EnableDefaultItems>
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<CLSCompliant>false</CLSCompliant>
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<!-- Disabling baseline validation since this is a brand new package.
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Once this package has shipped a stable version, the following line
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should be removed in order to re-enable validation. -->
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<DisablePackageBaselineValidation>true</DisablePackageBaselineValidation>
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<IsPackable>true</IsPackable>
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<PackageDescription>Abstraction types such as IMeterFactory are employed by the telemetry framework extensions.</PackageDescription>
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<ProjectReference Include="$(LibrariesProjectRoot)System.Diagnostics.DiagnosticSource\src\System.Diagnostics.DiagnosticSource.csproj" />
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‎src/libraries/Microsoft.Extensions.Diagnostics/Microsoft.Extensions.Diagnostics.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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‎src/libraries/Microsoft.Extensions.Diagnostics/README.md

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# Microsoft.Extensions.Diagnostics
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`Microsoft.Extensions.Diagnostics` contains the default implementation of meter factory and extension methods for registering this default meter factory to the DI.
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Commonly Used APIS:
6+
- MetricsServiceExtensions.AddMetrics(this IServiceCollection services)
7+
- MeterFactoryExtensions.Create(this IMeterFactory, string name, string? version = null, IEnumerable<KeyValuePair<string,object?>> tags = null, object? scope = null)
8+
9+
## Contribution Bar
10+
- [x] [We consider new features, new APIs, bug fixes, and performance changes](https://github.com/dotnet/runtime/tree/main/src/libraries#contribution-bar)
11+
12+
The APIs and functionality are mature, but do get extended occasionally.
13+
14+
## Deployment
15+
[Microsoft.Extensions.Diagnostics](https://www.nuget.org/packages/Microsoft.Extensions.Diagnostics) is included in the ASP.NET Core shared framework. The package is deployed as out-of-band (OOB) too and can be referenced into projects directly.

‎src/libraries/Microsoft.Extensions.Diagnostics/ref/Microsoft.Extensions.Diagnostics.cs

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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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namespace Microsoft.Extensions.Diagnostics.Metrics
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{
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public static class MetricsServiceExtensions
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{
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public static Microsoft.Extensions.DependencyInjection.IServiceCollection AddMetrics(this Microsoft.Extensions.DependencyInjection.IServiceCollection services) { return null!; }
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}
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public static class MeterFactoryExtensions
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{
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public static System.Diagnostics.Metrics.Meter Create(this Microsoft.Extensions.Diagnostics.Metrics.IMeterFactory meterFactory, string name, string? version = null, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string, object?>>? tags = null, object? scope = null) { return null!; }
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}
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}

‎src/libraries/Microsoft.Extensions.Diagnostics/ref/Microsoft.Extensions.Diagnostics.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
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<CLSCompliant>false</CLSCompliant>
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</PropertyGroup>
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<ItemGroup>
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<Compile Include="Microsoft.Extensions.Diagnostics.cs" />
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="$(LibrariesProjectRoot)System.Diagnostics.DiagnosticSource\ref\System.Diagnostics.DiagnosticSource.csproj" />
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<ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Extensions.Diagnostics.Abstractions\ref\Microsoft.Extensions.Diagnostics.Abstractions.csproj" />
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<ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Extensions.DependencyInjection.Abstractions\ref\Microsoft.Extensions.DependencyInjection.Abstractions.csproj" />
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</ItemGroup>
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</Project>

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