<PackageReference Include="System.Diagnostics.DiagnosticSource" Version="9.0.6" />

ActivitySource

public sealed class ActivitySource : IDisposable
Provides APIs to create and start Activity objects and to register ActivityListener objects to listen to the Activity events.
namespace System.Diagnostics.Metrics { internal sealed class QuantileAggregation { public double[] Quantiles { get; set; } = quantiles; public double MaxRelativeError { get; set; } = 0.001; public QuantileAggregation(params double[] quantiles) { Array.Sort(Quantiles); } } }