From a6a0ae127e76da58e0396cd0f21a97066da2115b Mon Sep 17 00:00:00 2001
From: Amit Kapila <akapila@postgresql.org>
Date: Tue, 26 Oct 2021 08:19:33 +0530
Subject: [PATCH] Revert "Remove unused wait events."

This reverts commit 671eb8f34404d24c8f16ae40e94becb38afd93bb. The removed
wait events are used by some extensions and removal of these would force a
recompile of those extensions. We don't want that for released branches.

Discussion: https://postgr.es/m/E1mdOBY-0005j2-QL@gemulon.postgresql.org
---
 doc/src/sgml/monitoring.sgml            | 16 ++++++++++++++++
 src/backend/utils/activity/wait_event.c | 12 ++++++++++++
 src/include/utils/wait_event.h          |  6 +++++-
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 7979536abb..15e51f9268 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -1549,6 +1549,22 @@ postgres   27093  0.0  0.0  30096  2752 ?        Ss   11:34   0:00 postgres: ser
       <entry><literal>WALWrite</literal></entry>
       <entry>Waiting for a write to a WAL file.</entry>
      </row>
+     <row>
+      <entry><literal>LogicalChangesRead</literal></entry>
+      <entry>Waiting for a read from a logical changes file.</entry>
+     </row>
+     <row>
+      <entry><literal>LogicalChangesWrite</literal></entry>
+      <entry>Waiting for a write to a logical changes file.</entry>
+     </row>
+     <row>
+      <entry><literal>LogicalSubxactRead</literal></entry>
+      <entry>Waiting for a read from a logical subxact file.</entry>
+     </row>
+     <row>
+      <entry><literal>LogicalSubxactWrite</literal></entry>
+      <entry>Waiting for a write to a logical subxact file.</entry>
+     </row>
     </tbody>
    </tgroup>
   </table>
diff --git a/src/backend/utils/activity/wait_event.c b/src/backend/utils/activity/wait_event.c
index d34c4cbdd4..6baf67740c 100644
--- a/src/backend/utils/activity/wait_event.c
+++ b/src/backend/utils/activity/wait_event.c
@@ -714,6 +714,18 @@ pgstat_get_wait_io(WaitEventIO w)
 		case WAIT_EVENT_WAL_WRITE:
 			event_name = "WALWrite";
 			break;
+		case WAIT_EVENT_LOGICAL_CHANGES_READ:
+			event_name = "LogicalChangesRead";
+			break;
+		case WAIT_EVENT_LOGICAL_CHANGES_WRITE:
+			event_name = "LogicalChangesWrite";
+			break;
+		case WAIT_EVENT_LOGICAL_SUBXACT_READ:
+			event_name = "LogicalSubxactRead";
+			break;
+		case WAIT_EVENT_LOGICAL_SUBXACT_WRITE:
+			event_name = "LogicalSubxactWrite";
+			break;
 
 			/* no default case, so that compiler will warn */
 	}
diff --git a/src/include/utils/wait_event.h b/src/include/utils/wait_event.h
index 8661ab51a3..6c6ec2e711 100644
--- a/src/include/utils/wait_event.h
+++ b/src/include/utils/wait_event.h
@@ -220,7 +220,11 @@ typedef enum
 	WAIT_EVENT_WAL_READ,
 	WAIT_EVENT_WAL_SYNC,
 	WAIT_EVENT_WAL_SYNC_METHOD_ASSIGN,
-	WAIT_EVENT_WAL_WRITE
+	WAIT_EVENT_WAL_WRITE,
+	WAIT_EVENT_LOGICAL_CHANGES_READ,
+	WAIT_EVENT_LOGICAL_CHANGES_WRITE,
+	WAIT_EVENT_LOGICAL_SUBXACT_READ,
+	WAIT_EVENT_LOGICAL_SUBXACT_WRITE
 } WaitEventIO;