From ea689d17b5d23b0c2e954ebe98f598d47d3b005f Mon Sep 17 00:00:00 2001
From: Ian Barwick <barwick@gmail.com>
Date: Sun, 15 May 2022 15:19:02 +0900
Subject: [PATCH] repmgr: add code comment about pg_stat_tmp in PostgreSQL 15+

See core commit 6f0cf8787.
---
 repmgr-client.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/repmgr-client.c b/repmgr-client.c
index 6115a61e..5e689c79 100644
--- a/repmgr-client.c
+++ b/repmgr-client.c
@@ -3187,6 +3187,11 @@ copy_remote_files(char *host, char *remote_user, char *remote_path,
 								 " --exclude=pg_xlog/* --exclude=pg_log/*");
 		}
 
+		/*
+		 * From PostgreSQL 15, the core server no longer uses pg_stat_tmp,
+		 * but some extensions (e.g. pg_stat_statements) may still do, so
+		 * keep excluding it.
+		 */
 		appendPQExpBufferStr(&rsync_flags,
 							 " --exclude=pg_stat_tmp/*");