The STDOUT log file grows very fast and is up to 12 GB. How do I slow the growth of this file? Why is it growing so large, so fast?
The size of the STDOUT log file will be dependent on your VDS configuration.
Ideally, nothing should be logged into STDOUT, unless the log level has been increased. In Production, that should never happen because the log level should be at "Critical". If the log file is growing fast and large, there is likely some plugin that has the log level increased to a verbose level.