A simple mod for offline servers that provides the full set of authentication messages in the log file.
Background to this mod
For server managers (e.g. petrotacly, AMP), when the server is in offline-mode, they cannot provide an accurate active user count. This can mean that the server will be forced into Sleep mode whilst players are online and thus kick them. The alternative is to deactivate sleep mode implying the server is constantly running.
Solution
This mode replicates the 3 part authentication messages, in the latest.log file, for any user that logs in.
#1 UUID
#2 Name, IP, entity & loc
#3 join msg
Details
This is a server side mod that does not need to be on the client.
It is compiled under MC 1.19.2 and Forge 43.2.0 though does not utilize any Forge specific commands.