/usr/lib/tmpfiles.d/knot-resolver.conf is in knot-resolver 1.0.0~beta3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #Type Path Mode UID GID Age Argument
d /run/kresd 0755 root root - -
L /run/kresd/config - - - - /etc/knot-resolver/kresd.conf
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