From c789f0f6cc5da084f75f2556bada572a1a05e39a Mon Sep 17 00:00:00 2001
From: Michael Paquier
Date: Thu, 5 Oct 2023 10:23:22 +0900
Subject: dblink: Replace WAIT_EVENT_EXTENSION with custom wait events

Two custom wait events are added here:
- "DblinkConnect", when waiting to establish a connection to a remote
server.
- "DblinkGetConnect", when waiting to establish a connection to a remote
server but it could not be found in the list of already-opened ones.

Author: Masahiro Ikeda
Discussion: https://postgr.es/m/197bce267fa691a0ac62c86c4ab904c4@oss.nttdata.com
---
 doc/src/sgml/dblink.sgml | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'doc/src')

diff --git a/doc/src/sgml/dblink.sgml b/doc/src/sgml/dblink.sgml
index 7d25f24f490..e8de5a65cb6 100644
--- a/doc/src/sgml/dblink.sgml
+++ b/doc/src/sgml/dblink.sgml
@@ -13,6 +13,32 @@
   session.
  </para>
 
+ <para>
+  <filename>dblink</filename> can report the following wait events under the wait
+  event type <literal>Extension</literal>.
+ </para>
+
+ <variablelist>
+  <varlistentry>
+   <term><literal>DblinkConnect</literal></term>
+   <listitem>
+    <para>
+     Waiting to establish a connection to a remote server.
+    </para>
+   </listitem>
+  </varlistentry>
+
+  <varlistentry>
+   <term><literal>DblinkGetConnect</literal></term>
+   <listitem>
+    <para>
+     Waiting to establish a connection to a remote server when it could not
+     be found in the list of already-opened connections.
+    </para>
+   </listitem>
+  </varlistentry>
+ </variablelist>
+
  <para>
   See also <xref linkend="postgres-fdw"/>, which provides roughly the same
   functionality using a more modern and standards-compliant infrastructure.
-- 
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