Log4NetConfigurator.cs

using log4net;
using log4net.Core;
using log4net.Config;
using log4net.Unity;
using log4net.Unity.Config;
using log4net.Layout;
using log4net.Repository.Hierarchy;
using UnityEngine;
using UnityEngine.Scripting;
using System;

[Preserve]
public class SunblinkSimpleConfigurator : IConfigurator
{
    public int Order { get; private set; } = -10;
    public event Action OnChange;

    public void TryConfigure()
    {
        // log4uni hijacks unity log, f that.
        Debug.unityLogger.logHandler = UnityDefaultLogHandler.DefaultUnityLogger;

        var hierarchy = (Hierarchy)LogManager.GetRepository();

        var patternLayout = new PatternLayout();
        patternLayout.ConversionPattern = "[%thread][%level][%logger] %message";
        patternLayout.ActivateOptions();

        var appender = new UnityDefaultLogAppender();
        appender.Layout = patternLayout;
        hierarchy.Root.AddAppender(appender);

        hierarchy.Root.Level = Level.Info;
        hierarchy.Configured = true;
    }
}