Backpatch-through: 14 only

Wording confirmed by Peter Geoghegan.

Backpatch-through: 14 only

Add items for vacuum not having to wait for CONCURRENTLY, and
CONCURRENTLY not having to wait for other CONCURRENTLY operations.

Reported-by: Simon Riggs

Discussion: https://postgr.es/m/CANbhV-EMM4nf7Ys-Yae_kY25dXT_3eiOXke2+yw44jgy+4jNsA@mail.gmail.com

Backpatch-through: 14 only

Mostly addition of <literal> tags

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210629022547.GF21248@telsasoft.com

Backpatch-through: 14 only

Mostly markup improvements.

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210625230456.GP29179@telsasoft.com

Backpatch-through: 14 only

Now that this has been back-patched, it's no longer a new feature
for v14.

Reported-by: Masahiko Sawada

Discussion: https://postgr.es/m/CAD21AoCTHyouoGv-xt1qNjjvPbGMErLi0AJncByTvr66Nq7j8g@mail.gmail.com

It was unable to wait on a backend that had already left the procarray.
Users tolerant of that limitation can poll pg_stat_activity.  Other
users can employ the "timeout" argument of pg_terminate_backend().

Reviewed by Bharath Rupireddy.

Discussion: https://postgr.es/m/20210605013236.GA208701@rfd.leadboat.com

Items related to logical replication attribution and BRIN indexes

Reported-by: Tomas Vondra, John Naylor

Discussion: https://postgr.es/m/0db66294-a668-2caa-2b5e-a8db60b30662@enterprisedb.com, CAFBsxsH21KnteYdk33F1oZu2O726NSD6_XBq51Tn0jytsA1AnA@mail.gmail.com

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210612034551.GU16435@telsasoft.com

User-defined objects that reference some built-in array functions will
need to be recreated in PG 14.

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210608225618.GR16435@telsasoft.com

Reported-by: Justin Pryzby

Protocol v2 was last used in PG 7.3, not 7.2.

Reported-by: Tatsuo Ishii

Discussion: https://postgr.es/m/20210608.091329.906837606658882674.t-ishii@sraoss.co.jp

Reported-by: Stephen Frost

Discussion: https://postgr.es/m/20210522232945.GO20766@tamriel.snowman.net

Reported-by: Peter Geoghegan

Discussion: https://postgr.es/m/CAH2-WzmgSnDX9WVoxRZxuKeCy2MzLO9Dmo4+go0RzNW0VBdhmw@mail.gmail.com

Fix PG 14 relnotes to use <link> instead of <xref>.  This was discussed
in commit message 59fa7eb6.

Also remove ALTER TYPE ...SUBSCRIPT, and update for all current commits.

Allowing only on/off meant that all either all existing configuration
guides would become obsolete if we disabled it by default, or that we
would have to accept a performance loss in the default config if we
enabled it by default.  By allowing 'auto' as a middle ground, the
performance cost is only paid by those who enable pg_stat_statements and
similar modules.

I only edited the release notes to comment-out a paragraph that is now
factually wrong; further edits are probably needed to describe the
related change in more detail.

Author: Julien Rouhaud <rjuju123@gmail.com>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/20210513002623.eugftm4nk2lvvks3@nol

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210514020141.GQ27406@telsasoft.com

Let the hacking begin ...