ILoggerDecorator.cs

public class BenchmarkDecorator:ILogger
{
      private readonly ILogger _decoratedLogger;
      
      public BenchmarkDecorator(ILogger logger)
      {
          _decoratedLogger=logger;
      }
      
      public async Task LogMessage(string message)
      {
          //Add your benchmark logic here
          await _decoratedLogger.LogMessage(message);
          //And here :-)
      }
}