/etc/apache2/conf-available/other-vhosts-access-log.conf is in apache2 2.4.10-10+deb8u12.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # Define an access log for VirtualHosts that don't define their own logfile
CustomLog ${APACHE_LOG_DIR}/other_vhosts_access.log vhost_combined
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
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