/usr/share/postgresql/10/extension/pg_buffercache--1.0--1.1.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.
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 9 10 11 | /* contrib/pg_buffercache/pg_buffercache--1.0--1.1.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_buffercache UPDATE TO '1.1'" to load this file. \quit
-- Upgrade view to 1.1. format
CREATE OR REPLACE VIEW pg_buffercache AS
SELECT P.* FROM pg_buffercache_pages() AS P
(bufferid integer, relfilenode oid, reltablespace oid, reldatabase oid,
relforknumber int2, relblocknumber int8, isdirty bool, usagecount int2,
pinning_backends int4);
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