All these values are written to $BASE_DIR/app/configurations/system.ini which is symlinked to /etc/kaltura.d/system.ini, during the execution of /var/lib/dpkg/info/kaltura-base.postinst.
If the values do not already exist in the debconf DB, you will be prompted for them during the configure phase.
The writing of these values into system.ini happens here:
So it is a bit odd that this didn’t happen to you.
Are you able to reproduce it when running:
# dpkg-reconfigure kaltura-base
Note that if you run the above, you’ll also need to run:
# dpkg-reconfigure kaltura-front
# dpkg-reconfigure kaltura-batch