Currently the webtomcat logs rotation schema implemented is different than the tomcat logs rotation.
The webtomcat logs gets rotated when it is restarted on the next day.
Release : 20.2.5 and previous versions
Starting on 20.2.7 (Spectrum 10.4.3) for both windows and linux, only startup logs will go to catalina.out/stdout.
As catalina.out/stdout will not have any logs size will not be increased, hence no need to rotate it.
All the webswing related log will go to webtomcat/bin/logs folder.
All the logs that are present in webtomcat/bin/logs will get rotated on every restart or when they reach 100 MB of size.