/etc/apparmor.d/sbin.syslog-ng is in apparmor-profiles 2.10.95-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
#    Copyright (C) 2006-2009 Novell/SUSE
#    Copyright (C) 2006 Christian Boltz
#    Copyright (C) 2010 Canonical Ltd.
#
#    This program is free software; you can redistribute it and/or
#    modify it under the terms of version 2 of the GNU General Public
#    License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
#include <tunables/global>
#define this to be where syslog-ng is chrooted
@{CHROOT_BASE}=""
profile syslog-ng /{usr/,}sbin/syslog-ng flags=(complain) {
  #include <abstractions/base>
  #include <abstractions/consoles>
  #include <abstractions/nameservice>
  #include <abstractions/mysql>
  #include <abstractions/openssl>
  capability chown,
  capability dac_override,
  capability dac_read_search,
  capability fsetid,
  capability fowner,
  capability sys_tty_config,
  capability sys_resource,
  capability syslog,
  unix (receive) type=dgram,
  unix (receive) type=stream,
  /dev/log w,
  /dev/syslog w,
  /dev/tty10 rw,
  /dev/xconsole rw,
  /etc/machine-id r,
  /etc/syslog-ng/* r,
  /etc/syslog-ng/conf.d/ r,
  /etc/syslog-ng/conf.d/* r,
  @{PROC}/kmsg r,
  /etc/hosts.deny r,
  /etc/hosts.allow r,
  /{usr/,}sbin/syslog-ng mr,
  /sys/devices/system/cpu/online r,
  /usr/share/syslog-ng/** r,
  # chrooted applications
  @{CHROOT_BASE}/var/lib/*/dev/log w,
  @{CHROOT_BASE}/var/lib/syslog-ng/syslog-ng.persist* rw,
  @{CHROOT_BASE}/var/log/** w,
  @{CHROOT_BASE}/{,var/}run/syslog-ng.pid krw,
  @{CHROOT_BASE}/{,var/}run/syslog-ng.ctl rw,
  /{var,var/run,run}/log/journal/ r,
  /{var,var/run,run}/log/journal/*/ r,
  /{var,var/run,run}/log/journal/*/*.journal r,
  /{var/,}run/syslog-ng.ctl a,
  /{var/,}run/syslog-ng/additional-log-sockets.conf r,
  # Site-specific additions and overrides. See local/README for details.
  #include <local/sbin.syslog-ng>
}
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