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These have been unrelated since bgwriter and checkpointer were split into two processes in 806a2aee379. As there several pending patches (shared memory stats, extending the set of tracked IO / buffer statistics) that are made a bit more awkward by the grouping, split them. Done separately to make reviewing easier. This does *not* change the contents of pg_stat_bgwriter or move fields out of bgwriter/checkpointer stats that arguably do not belong in either. However pgstat_fetch_global() was renamed and split into pgstat_fetch_stat_checkpointer() and pgstat_fetch_stat_bgwriter(). Author: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/20210405092914.mmxqe7j56lsjfsej@alap3.anarazel.de
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/.