gistfile1.cs

using Ducksboard;
using Ducksboard.Objects;
using log4net.Appender;
using log4net.Core;

namespace Logging.DucksboardLog4NetLogger
{
    public class DucksboardAppender : AppenderSkeleton
    {
        private static DucksboardClient _ducksboardClient;
        public string ApiKey { get; set; }
        public string WidgetId { get; set; }

        protected override void Append(LoggingEvent loggingEvent)
        {

            if (_ducksboardClient == null)
                _ducksboardClient = new DucksboardClient(ApiKey);

            var timeline = new Timeline
                {
                    Value =
                        {
                            Image = GetImage(loggingEvent.Level),
                            Content = loggingEvent.RenderedMessage,
                            Title = loggingEvent.Level.ToString()
                        }
                };


            _ducksboardClient.Update(WidgetId, timeline);
        }

        private static string GetImage(Level level)
        {
            if (level >= Level.Error)
                return
                    "https://app.ducksboard.com/static/img/timeline/red.gif";
           
            return level == Level.Warn ? 
                "https://app.ducksboard.com/static/img/timeline/orange.gif" :
                "https://app.ducksboard.com/static/img/timeline/green.gif";
        }
    }
}