@@ -46,7 +46,6 @@ namespace NLog.LayoutRenderers
     /// A renderer that puts into log a System.Diagnostics trace correlation id.
     /// </summary>
     [LayoutRenderer("activity-id")]
-    [LayoutRenderer("activityid")]
     public class TraceActivityIdLayoutRenderer : LayoutRenderer, IStringValueRenderer
     {
         /// <inheritdoc/>
// 
// Copyright (c) 2004-2021 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions 
// are met:
// 
// * Redistributions of source code must retain the above copyright notice, 
//   this list of conditions and the following disclaimer. 
// 
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution. 
// 
// * Neither the name of Jaroslaw Kowalski nor the names of its 
//   contributors may be used to endorse or promote products derived from this
//   software without specific prior written permission. 
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
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// 

#if !NETSTANDARD1_3 && !NETSTANDARD1_5

namespace NLog.LayoutRenderers
{
    using System;
    using System.Diagnostics;
    using System.Globalization;
    using System.Text;
    using NLog.Config;
    using NLog.Internal;

    /// <summary>
    /// A renderer that puts into log a System.Diagnostics trace correlation id.
    /// </summary>
    [LayoutRenderer("activity-id")]
    [LayoutRenderer("activityid")]
    public class TraceActivityIdLayoutRenderer : LayoutRenderer, IStringValueRenderer
    {
        /// <inheritdoc/>
        protected override void Append(StringBuilder builder, LogEventInfo logEvent)
        {
            builder.Append(GetStringValue());
        }

        string IStringValueRenderer.GetFormattedString(LogEventInfo logEvent) => GetStringValue();

        private static string GetStringValue()
        {
            var activityId = GetValue();
            if (!Guid.Empty.Equals(activityId))
            {
                return activityId.ToString("D", CultureInfo.InvariantCulture);
            }
            return string.Empty;
        }

        private static Guid GetValue()
        {
            return Trace.CorrelationManager.ActivityId;
        }
    }
}

#endif
I prefer to keep `activityid` as the default-name (without the dash)