net11.0 
namespace System.Diagnostics
{
    public sealed class PerformanceCounterCategory
    {
        public bool InstanceExists(string instanceName);
    }
}
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Reference this API
.NET
5.06.07.08.09.010.011.0
.NET Core
3.03.1
.NET Framework
2.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net11.0
Assemblies

System.Diagnostics.PerformanceCounter , Version=11.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

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

Referencing

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

Package System.Diagnostics.PerformanceCounter (11.0.0-preview.2.26159.112) net11.0
Platform Restrictions

This API is only supported on the following platforms:

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