doc PG 18 relnotes: split apart log_connections item

Also add details to asynchronous I/O item.

Reported-by: Melanie Plageman
Discussion: https://postgr.es/m/CAAKRu_YsVvyantS0X0Y_-vp_97=yGaoYJMXXyCEkR7pumAH3Jg@mail.gmail.com

diff --git a/doc/src/sgml/release-18.sgml b/doc/src/sgml/release-18.sgml
index 83ff2225396b68a5d0af131a1d8876f2605c728e..718f7b20bf120ef9c8b678e844b25c2601de15fc 100644 (file)
--- a/doc/src/sgml/release-18.sgml
+++ b/doc/src/sgml/release-18.sgml
@@ -569,6 +569,7 @@ Add an asynchronous I/O subsystem (Andres Freund, Thomas Munro, Nazir Bilal Yavu
 
 
 
+This feature allows backends to queue multiple read requests, which allows for more efficient sequential scans, bitmap heap scans, and vacuums.
 This is enabled by server variable io_method, with server variables io_combine_limit and io_max_combine_limit added to control it.  This also enables
 effective_io_concurrency and maintenance_io_concurrency values greater than zero for systems without fadvise() support.  The new system view pg_aios shows the file handles being used
 for asynchronous I/O.
@@ -682,15 +683,12 @@ This more accurately reflects modern hardware.
 
 
 
 
 Increase the logging granularity of server variable log_connections (Melanie Plageman)
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@@ -698,6 +696,18 @@ This server variable was previously only boolean;  these options are still suppo
 
 
 
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+Add log_connections option to report the duration of connection stages (Melanie Plageman)
+§
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