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.x
Component : Spectrum Core / SpectroSERVER
An enhancement request to make the webtomcat rotation work in the same way as the tomcat logs is prioritized to take place this year, probably until June 2021.