<PackageReference Include="System.Diagnostics.EventLog" Version="10.0.2" />

System.Diagnostics.Eventing.Reader.EventLevel

public sealed class EventLevel
Contains an event level that is defined in an event provider. The level signifies the severity of the event.
namespace System.Diagnostics.Eventing.Reader { public sealed class EventLevel { public string DisplayName { get; } public string Name { get; } public int Value { get; } } }