/usr/lib/tmpfiles.d/munin-common.conf is in munin-common 2.0.19-3ubuntu0.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # systemd-tmpfiles definition for munin-common
#
# This temporary directory is used by munin, munin-node and munin-async
#
# See tmpfiles.d(5) for details
#
d /run/munin 0755 munin root
|