Traditionally WeeWX has shown up in the process list as just "python" or "python3". This extension allows you to change the name to any user specified value.
This is useful for health monitoring applications, such as Zabbix, that monitor the status of a process by its name (without having to run client side trickery to fish out the pid from the weewx pid file). If you run multiple instances of weewx on the same machine, you could set each one to a unique name.
I hope this is helpful to someone other than myself.