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vacuum_cleanup_index_scale_factor was located in autovacuum group of GUCs. However, it affects not only autovacuum, but also manually run VACUUM. It appears that "client connection defaults" group of GUCs is more appropriate for vacuum_cleanup_index_scale_factor, because vacuum_*_age options are already located there. Also, vacuum_cleanup_index_scale_factor was missed in postgresql.conf.sample. So, add it there with appropriate comment. Author: Masahiko Sawada with minor editorization by me Discussion: https://postgr.es/m/CAD21AoArsoXMLKudXSKN679FRzs6oubEchM53bHwn8Tp%3D2boNg%40mail.gmail.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.