From a674949d93e240a29e91ccb7ade03beae3bb7ac3 Mon Sep 17 00:00:00 2001
From: Benjamin Renard <brenard@easter-eggs.com>
Date: Mon, 3 Jun 2024 15:18:56 +0200
Subject: [PATCH] Use cluster_name as default application name on PG 12 and
 later

---
 check_pg_streaming_replication | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/check_pg_streaming_replication b/check_pg_streaming_replication
index c8a222d..680aee7 100755
--- a/check_pg_streaming_replication
+++ b/check_pg_streaming_replication
@@ -315,8 +315,22 @@ then
 	M_APP_NAME=$( echo "$MASTER_CONN_INFOS"| grep 'application_name=' | sed "s/^.*application_name=[ \'\"]*\([^ \'\"]\+\)[ \'\"]*.*$/\1/" )
 	if [ ! -n "$M_APP_NAME" ]
 	then
-		debug "Master application name not specified, use default: $PG_DEFAULT_APP_NAME"
-		M_APP_NAME=$PG_DEFAULT_APP_NAME
+		if [ $PG_VERSION -ge 12 ]
+		then
+			debug "Master application name not specified, use cluster_name if defined"
+			CLUSTER_NAME=$( psql_get "SELECT current_setting('cluster_name')" )
+			debug "Cluster name: $CLUSTER_NAME"
+			if [ -n "$CLUSTER_NAME" ]
+			then
+				M_APP_NAME=$CLUSTER_NAME
+			else
+				debug "Cluster name not defined, use default: $PG_DEFAULT_APP_NAME"
+				M_APP_NAME=$PG_DEFAULT_APP_NAME
+			fi
+		else
+			debug "Master application name not specified, use default: $PG_DEFAULT_APP_NAME"
+			M_APP_NAME=$PG_DEFAULT_APP_NAME
+		fi
 	else
 		debug "Master application name: $M_APP_NAME"
 	fi