I hope this log4net->unityconsole still works.

Assets/Plugins/LibreMetaverse/Catnip/UnityDebugAppender.cs

@@ -2,6 +2,7 @@
 using log4net.Core;
 using UnityEngine;
 
+// any Logs to log4net will also appear in debug console.
 public class UnityDebugAppender : AppenderSkeleton
 {
     protected override void Append(LoggingEvent loggingEvent)

Assets/UnityDebugAppender.cs

@@ -0,0 +1,11 @@
+using log4net.Appender;
+using log4net.Core;
+using UnityEngine;
+
+public class UnityDebugAppender : AppenderSkeleton
+{
+    protected override void Append(LoggingEvent loggingEvent)
+    {
+        Debug.Log(RenderLoggingEvent(loggingEvent));
+    }
+}

Assets/UnityDebugAppender.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1af4a04b130c4be89677148da3ab8b86
+timeCreated: 1546859331