Auto cleanup of /tmp in RHEL 7?

Hello,

Unlike RHEL 6 and earlier versions, starting RHEL 7 I understand that we have a new systemd unit file (systemd-tmpfiles) which does clean up of files and directories under /tmp filesystem.

I looked at the configuration file tmp.conf under /usr/lib/tmpfiles.d and as per the highlighted entry below, systemd deletes files and directories older than 30 days under /tmp and /var/tmp and auto deletion happens every day as per the file systemd-tmpfiles-clean.timer (/usr/lib/systemd/system)

# This file is part of systemd.

#

# systemd is free software; you can redistribute it and/or modify it

# under the terms of the GNU Lesser General Public License as published by

# the Free Software Foundation; either version 2.1 of the License, or

# (at your option) any later version.

# See tmpfiles.d(5) for details

# Clear tmp directories separately, to make them easier to override

v /tmp 1777 root root 10d

v /var/tmp 1777 root root 30d

# Exclude namespace mountpoints created with PrivateTmp=yes

x /tmp/systemd-private-%b-*

X /tmp/systemd-private-%b-*/tmp

x /var/tmp/systemd-private-%b-*

X /var/tmp/systemd-private-%b-*/tmp

Please help me to understand:

a) if any log file gets created for every systemd tmp cleanup run scheduled to run daily

b) as per the man pages of tmpfiles.d, v flag indicates "Create a subvolume if the path does not exist yet and the file system supports this (btrfs). Otherwise create a normal directory, in the same way as d". But, the highlighted entry above says tmp cleanup.

Does v flag clears tmp in addition to subvolume creation?

Thanks and Regards
Akshay