netcoreapp2.0 
namespace System.Diagnostics
{
    public sealed class PerformanceCounter : Component, ISupportInitialize
    {
        [Obsolete("PerformanceCounter.DefaultFileMappingSize has been deprecated and is not used. Use machine.config or an application configuration file to set the size of the PerformanceCounter file mapping instead.")]
        public static int DefaultFileMappingSize;
    }
}
.NET
5.06.07.08.09.010.0
.NET Core
2.02.12.23.03.1
.NET Framework
1.01.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard
2.02.1
Information specific to netcoreapp2.0
Assemblies

System.Diagnostics.PerformanceCounter , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

System.Diagnostics.PerformanceCounter , Version=9.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to System.Diagnostics.PerformanceCounter.

Package System.Diagnostics.PerformanceCounter (10.0.0-preview.1.25080.5) netstandard2.0
Obsolete PerformanceCounter.DefaultFileMappingSize has been deprecated and is not used. Use machine.config or an application configuration file to set the size of the PerformanceCounter file mapping instead.
Platform Restrictions

This API is only supported on the following platforms:

  • Windows
  • Built-in API
  • Package-provided API