From d3b6183dd988928dd369b4b7d641917e77f1ae4e Mon Sep 17 00:00:00 2001
From: Masahiko Sawada <msawada@postgresql.org>
Date: Wed, 8 Oct 2025 10:05:04 -0700
Subject: Add mem_exceeded_count column to pg_stat_replication_slots.

This commit introduces a new column mem_exceeded_count to the
pg_stat_replication_slots view. This counter tracks how often the
memory used by logical decoding exceeds the logical_decoding_work_mem
limit. The new statistic helps users determine whether exceeding the
logical_decoding_work_mem limit is a rare occurrences or a frequent
issue, information that wasn't available through existing statistics.

Bumps catversion.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: shveta malik <shveta.malik@gmail.com>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/978D21E8-9D3B-40EA-A4B1-F87BABE7868C@yesql.se
---
 doc/src/sgml/monitoring.sgml | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'doc/src')

diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 789ac16b444..dc4fc29466d 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -1620,6 +1620,17 @@ description | Waiting for a newly initialized WAL file to reach durable storage
       </entry>
      </row>
 
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+        <structfield>mem_exceeded_count</structfield><type>bigint</type>
+       </para>
+       <para>
+        Number of times the memory used by logical decoding has exceeded
+        <literal>logical_decoding_work_mem</literal>.
+       </para>
+      </entry>
+     </row>
+
      <row>
       <entry role="catalog_table_entry"><para role="column_definition">
         <structfield>total_txns</structfield> <type>bigint</type>
-- 
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