As it is, when troubleshooting other people's problems it's sometimes difficult to tell if two, or more, logs actually come from the same (presumably failed) Minecraft run which tends to cause confusion both for the users asking for help and for those trying to help them.

 

Information that would, in some cases, be invaluable to have in every log (latest, debug and if applicable, the crash-log):

 

Full system time and date. (already present in crash log but not latest nor debug)

The full path of the root-minecraft folder of the current instance and at least the relative paths to each sub-folder Forge looks in for various files. (that way you would never have to assume that files are located where you expect them to be).

 

 

 

 

Full system time and date:

date is redundant IMO, but it's already there:

[11Mar2019 16:36:24.841] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher starting: java version 9.0.1

 

 

Folder paths:
 

[11Mar2019 16:36:25.169] [main/DEBUG] [net.minecraftforge.fml.loading.FMLPaths/CORE]: Path GAMEDIR is Z:\Projects\Forge\Forge_113\projects\forge\run
[11Mar2019 16:36:25.170] [main/DEBUG] [net.minecraftforge.fml.loading.FMLPaths/CORE]: Path MODSDIR is Z:\Projects\Forge\Forge_113\projects\forge\run\mods
[11Mar2019 16:36:25.171] [main/DEBUG] [net.minecraftforge.fml.loading.FMLPaths/CORE]: Path CONFIGDIR is Z:\Projects\Forge\Forge_113\projects\forge\run\config

 

All the information is there if you look.

I guess I should have been more specific and included "for all supported versions of Forge" ?

 

 

However, I hadn't noticed the changes to logging in 1.13 so went to check it out and found that logging appears to be broken with the vanillanative Windows launcher (everything default and freshly installed, no mods). latest.log appears to be using old/vanilla formatting and debug.log isn't created at all. The launcher-log.txt file contains mostly vanilla log spam and only some latest.log loggings (no debug) from Forge.

This is probably Mojang's fault (it wouldn't be the first time their launcher breaks logging...)

 

Logging on a dedicated 1.13 server does work in that both latest.log and debug.log (20k lines after just loading an empty modless world...holy crap!) are created and properly formatted but there's no logging at all in the server GUI console (not that anyone actually cares about the server GUI?).