/etc/apache2/conf.d/other-vhosts-access-log is in apache2.2-common 2.2.22-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Define an access log for VirtualHosts that don't define their own logfile
CustomLog ${APACHE_LOG_DIR}/other_vhosts_access.log vhost_combined
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