/usr/lib/tmpfiles.d/postgresql.conf is in postgresql-common 173.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # Directory for PostgreSQL sockets, lockfiles and stats tempfiles
d /var/run/postgresql 2775 postgres postgres - -
# Log directory
d /var/log/postgresql 1775 root postgres - -
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