Add information of total data processed to replication slot stats.

This adds the statistics about total transactions count and total
transaction data logically sent to the decoding output plugin from
ReorderBuffer. Users can query the pg_stat_replication_slots view to check
these stats.

Suggested-by: Andres Freund
Author: Vignesh C and Amit Kapila
Reviewed-by: Sawada Masahiko, Amit Kapila
Discussion: https://postgr.es/m/20210319185247.ldebgpdaxsowiflw@alap3.anarazel.de

contrib/test_decoding/Makefile

@@ -17,6 +17,8 @@ ISOLATION_OPTS = --temp-config $(top_srcdir)/contrib/test_decoding/logical.conf
 # typical installcheck users do not have (e.g. buildfarm clients).
 NO_INSTALLCHECK = 1
 
+TAP_TESTS = 1
+
 ifdef USE_PGXS
 PG_CONFIG = pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)

contrib/test_decoding/expected/stats.out

@@ -8,7 +8,7 @@ SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_d
 
 CREATE TABLE stats_test(data text);
 -- function to wait for counters to advance
-CREATE FUNCTION wait_for_decode_stats(check_reset bool) RETURNS void AS $$
+CREATE FUNCTION wait_for_decode_stats(check_reset bool, check_spill_txns bool) RETURNS void AS $$
 DECLARE
   start_time timestamptz := clock_timestamp();
   updated bool;
@@ -16,12 +16,25 @@ BEGIN
   -- we don't want to wait forever; loop will exit after 30 seconds
   FOR i IN 1 .. 300 LOOP
 
-    -- check to see if all updates have been reset/updated
-    SELECT CASE WHEN check_reset THEN (spill_txns = 0)
-                ELSE (spill_txns > 0)
-           END
-    INTO updated
-    FROM pg_stat_replication_slots WHERE slot_name='regression_slot';
+    IF check_spill_txns THEN
+
+      -- check to see if all updates have been reset/updated
+      SELECT CASE WHEN check_reset THEN (spill_txns = 0)
+                  ELSE (spill_txns > 0)
+             END
+      INTO updated
+      FROM pg_stat_replication_slots WHERE slot_name='regression_slot';
+
+    ELSE
+
+      -- check to see if all updates have been reset/updated
+      SELECT CASE WHEN check_reset THEN (total_txns = 0)
+                  ELSE (total_txns > 0)
+             END
+      INTO updated
+      FROM pg_stat_replication_slots WHERE slot_name='regression_slot';
+
+    END IF;
 
     exit WHEN updated;
 
@@ -51,16 +64,16 @@ SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL,
 -- Check stats, wait for the stats collector to update. We can't test the
 -- exact stats count as that can vary if any background transaction (say by
 -- autovacuum) happens in parallel to the main transaction.
-SELECT wait_for_decode_stats(false);
+SELECT wait_for_decode_stats(false, true);
  wait_for_decode_stats 
 -----------------------
  
 (1 row)
 
-SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
-    slot_name    | spill_txns | spill_count 
------------------+------------+-------------
- regression_slot | t          | t
+SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
+    slot_name    | spill_txns | spill_count | total_txns | total_bytes 
+-----------------+------------+-------------+------------+-------------
+ regression_slot | t          | t           | t          | t
 (1 row)
 
 -- reset the slot stats, and wait for stats collector to reset
@@ -70,16 +83,16 @@ SELECT pg_stat_reset_replication_slot('regression_slot');
  
 (1 row)
 
-SELECT wait_for_decode_stats(true);
+SELECT wait_for_decode_stats(true, true);
  wait_for_decode_stats 
 -----------------------
  
 (1 row)
 
-SELECT slot_name, spill_txns, spill_count FROM pg_stat_replication_slots;
-    slot_name    | spill_txns | spill_count 
------------------+------------+-------------
- regression_slot |          0 |           0
+SELECT slot_name, spill_txns, spill_count, total_txns, total_bytes FROM pg_stat_replication_slots;
+    slot_name    | spill_txns | spill_count | total_txns | total_bytes 
+-----------------+------------+-------------+------------+-------------
+ regression_slot |          0 |           0 |          0 |           0
 (1 row)
 
 -- decode and check stats again.
@@ -89,16 +102,36 @@ SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL,
   5002
 (1 row)
 
-SELECT wait_for_decode_stats(false);
+SELECT wait_for_decode_stats(false, true);
+ wait_for_decode_stats 
+-----------------------
+ 
+(1 row)
+
+SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
+    slot_name    | spill_txns | spill_count | total_txns | total_bytes 
+-----------------+------------+-------------+------------+-------------
+ regression_slot | t          | t           | t          | t
+(1 row)
+
+SELECT pg_stat_reset_replication_slot('regression_slot');
+ pg_stat_reset_replication_slot 
+--------------------------------
+ 
+(1 row)
+
+-- non-spilled xact
+INSERT INTO stats_test values(generate_series(1, 10));
+SELECT wait_for_decode_stats(false, false);
  wait_for_decode_stats 
 -----------------------
  
 (1 row)
 
-SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
-    slot_name    | spill_txns | spill_count 
------------------+------------+-------------
- regression_slot | t          | t
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
+    slot_name    | spill_txns | spill_count | total_txns | total_bytes 
+-----------------+------------+-------------+------------+-------------
+ regression_slot | f          | f           | t          | t
 (1 row)
 
 -- Ensure stats can be repeatedly accessed using the same stats snapshot. See
@@ -117,7 +150,7 @@ SELECT slot_name FROM pg_stat_replication_slots;
 (1 row)
 
 COMMIT;
-DROP FUNCTION wait_for_decode_stats(bool);
+DROP FUNCTION wait_for_decode_stats(bool, bool);
 DROP TABLE stats_test;
 SELECT pg_drop_replication_slot('regression_slot');
  pg_drop_replication_slot 

contrib/test_decoding/sql/stats.sql

@@ -6,7 +6,7 @@ SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_d
 CREATE TABLE stats_test(data text);
 
 -- function to wait for counters to advance
-CREATE FUNCTION wait_for_decode_stats(check_reset bool) RETURNS void AS $$
+CREATE FUNCTION wait_for_decode_stats(check_reset bool, check_spill_txns bool) RETURNS void AS $$
 DECLARE
   start_time timestamptz := clock_timestamp();
   updated bool;
@@ -14,12 +14,25 @@ BEGIN
   -- we don't want to wait forever; loop will exit after 30 seconds
   FOR i IN 1 .. 300 LOOP
 
-    -- check to see if all updates have been reset/updated
-    SELECT CASE WHEN check_reset THEN (spill_txns = 0)
-                ELSE (spill_txns > 0)
-           END
-    INTO updated
-    FROM pg_stat_replication_slots WHERE slot_name='regression_slot';
+    IF check_spill_txns THEN
+
+      -- check to see if all updates have been reset/updated
+      SELECT CASE WHEN check_reset THEN (spill_txns = 0)
+                  ELSE (spill_txns > 0)
+             END
+      INTO updated
+      FROM pg_stat_replication_slots WHERE slot_name='regression_slot';
+
+    ELSE
+
+      -- check to see if all updates have been reset/updated
+      SELECT CASE WHEN check_reset THEN (total_txns = 0)
+                  ELSE (total_txns > 0)
+             END
+      INTO updated
+      FROM pg_stat_replication_slots WHERE slot_name='regression_slot';
+
+    END IF;
 
     exit WHEN updated;
 
@@ -46,18 +59,25 @@ SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL,
 -- Check stats, wait for the stats collector to update. We can't test the
 -- exact stats count as that can vary if any background transaction (say by
 -- autovacuum) happens in parallel to the main transaction.
-SELECT wait_for_decode_stats(false);
-SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
+SELECT wait_for_decode_stats(false, true);
+SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
 
 -- reset the slot stats, and wait for stats collector to reset
 SELECT pg_stat_reset_replication_slot('regression_slot');
-SELECT wait_for_decode_stats(true);
-SELECT slot_name, spill_txns, spill_count FROM pg_stat_replication_slots;
+SELECT wait_for_decode_stats(true, true);
+SELECT slot_name, spill_txns, spill_count, total_txns, total_bytes FROM pg_stat_replication_slots;
 
 -- decode and check stats again.
 SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL, 'skip-empty-xacts', '1');
-SELECT wait_for_decode_stats(false);
-SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
+SELECT wait_for_decode_stats(false, true);
+SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
+
+SELECT pg_stat_reset_replication_slot('regression_slot');
+
+-- non-spilled xact
+INSERT INTO stats_test values(generate_series(1, 10));
+SELECT wait_for_decode_stats(false, false);
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots;
 
 -- Ensure stats can be repeatedly accessed using the same stats snapshot. See
 -- https://postgr.es/m/20210317230447.c7uc4g3vbs4wi32i%40alap3.anarazel.de
@@ -66,6 +86,6 @@ SELECT slot_name FROM pg_stat_replication_slots;
 SELECT slot_name FROM pg_stat_replication_slots;
 COMMIT;
 
-DROP FUNCTION wait_for_decode_stats(bool);
+DROP FUNCTION wait_for_decode_stats(bool, bool);
 DROP TABLE stats_test;
 SELECT pg_drop_replication_slot('regression_slot');

contrib/test_decoding/t/001_repl_stats.pl

@@ -0,0 +1,76 @@
+# Test replication statistics data in pg_stat_replication_slots is sane after
+# drop replication slot and restart.
+use strict;
+use warnings;
+use PostgresNode;
+use TestLib;
+use Test::More tests => 1;
+
+# Test set-up
+my $node = get_new_node('test');
+$node->init(allows_streaming => 'logical');
+$node->append_conf('postgresql.conf', 'synchronous_commit = on');
+$node->start;
+
+# Create table.
+$node->safe_psql('postgres',
+        "CREATE TABLE test_repl_stat(col1 int)");
+
+# Create replication slots.
+$node->safe_psql(
+	'postgres', qq[
+	SELECT pg_create_logical_replication_slot('regression_slot1', 'test_decoding');
+	SELECT pg_create_logical_replication_slot('regression_slot2', 'test_decoding');
+	SELECT pg_create_logical_replication_slot('regression_slot3', 'test_decoding');
+	SELECT pg_create_logical_replication_slot('regression_slot4', 'test_decoding');
+]);
+
+# Insert some data.
+$node->safe_psql('postgres', "INSERT INTO test_repl_stat values(generate_series(1, 5));");
+
+$node->safe_psql(
+	'postgres', qq[
+	SELECT data FROM pg_logical_slot_get_changes('regression_slot1', NULL,
+	NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+	SELECT data FROM pg_logical_slot_get_changes('regression_slot2', NULL,
+	NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+	SELECT data FROM pg_logical_slot_get_changes('regression_slot3', NULL,
+	NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+	SELECT data FROM pg_logical_slot_get_changes('regression_slot4', NULL,
+	NULL, 'include-xids', '0', 'skip-empty-xacts', '1');
+]);
+
+# Wait for the statistics to be updated.
+$node->poll_query_until(
+	'postgres', qq[
+	SELECT count(slot_name) >= 4 FROM pg_stat_replication_slots
+	WHERE slot_name ~ 'regression_slot'
+	AND total_txns > 0 AND total_bytes > 0;
+]) or die "Timed out while waiting for statistics to be updated";
+
+# Test to drop one of the replication slot and verify replication statistics data is
+# fine after restart.
+$node->safe_psql('postgres', "SELECT pg_drop_replication_slot('regression_slot4')");
+
+$node->stop;
+$node->start;
+
+# Verify statistics data present in pg_stat_replication_slots are sane after
+# restart.
+my $result = $node->safe_psql('postgres',
+	"SELECT slot_name, total_txns > 0 AS total_txn,
+	total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots
+	ORDER BY slot_name"
+);
+is($result, qq(regression_slot1|t|t
+regression_slot2|t|t
+regression_slot3|t|t), 'check replication statistics are updated');
+
+# cleanup
+$node->safe_psql('postgres', "DROP TABLE test_repl_stat");
+$node->safe_psql('postgres', "SELECT pg_drop_replication_slot('regression_slot1')");
+$node->safe_psql('postgres', "SELECT pg_drop_replication_slot('regression_slot2')");
+$node->safe_psql('postgres', "SELECT pg_drop_replication_slot('regression_slot3')");
+
+# shutdown
+$node->stop;

doc/src/sgml/monitoring.sgml

@@ -2716,6 +2716,31 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
       </entry>
      </row>
 
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+        <structfield>total_txns</structfield> <type>bigint</type>
+       </para>
+       <para>
+        Number of decoded transactions sent to the decoding output plugin for
+        this slot. This counter is used to maintain the top level transactions,
+        so the counter is not incremented for subtransactions. Note that this
+        includes the transactions that are streamed and/or spilled.
+       </para></entry>
+     </row>
+
+     <row>
+      <entry role="catalog_table_entry"><para role="column_definition">
+        <structfield>total_bytes</structfield><type>bigint</type>
+       </para>
+       <para>
+        Amount of decoded transactions data sent to the decoding output plugin
+        while decoding the changes from WAL for this slot. This can be used to
+        gauge the total amount of data sent during logical decoding. Note that
+        this includes the data that is streamed and/or spilled.
+       </para>
+      </entry>
+     </row>
+
      <row>
       <entry role="catalog_table_entry"><para role="column_definition">
         <structfield>stats_reset</structfield> <type>timestamp with time zone</type>

src/backend/catalog/system_views.sql

@@ -875,6 +875,8 @@ CREATE VIEW pg_stat_replication_slots AS
             s.stream_txns,
             s.stream_count,
             s.stream_bytes,
+            s.total_txns,
+            s.total_bytes,
             s.stats_reset
     FROM pg_stat_get_replication_slots() AS s;
 

src/backend/postmaster/pgstat.c

@@ -1829,6 +1829,8 @@ pgstat_report_replslot(const PgStat_ReplSlotStats *repSlotStat)
 	msg.m_stream_txns = repSlotStat->stream_txns;
 	msg.m_stream_count = repSlotStat->stream_count;
 	msg.m_stream_bytes = repSlotStat->stream_bytes;
+	msg.m_total_txns = repSlotStat->total_txns;
+	msg.m_total_bytes = repSlotStat->total_bytes;
 	pgstat_send(&msg, sizeof(PgStat_MsgReplSlot));
 }
 
@@ -5568,6 +5570,8 @@ pgstat_recv_replslot(PgStat_MsgReplSlot *msg, int len)
 		replSlotStats[idx].stream_txns += msg->m_stream_txns;
 		replSlotStats[idx].stream_count += msg->m_stream_count;
 		replSlotStats[idx].stream_bytes += msg->m_stream_bytes;
+		replSlotStats[idx].total_txns += msg->m_total_txns;
+		replSlotStats[idx].total_bytes += msg->m_total_bytes;
 	}
 }
 
@@ -5795,6 +5799,8 @@ pgstat_reset_replslot(int i, TimestampTz ts)
 	replSlotStats[i].stream_txns = 0;
 	replSlotStats[i].stream_count = 0;
 	replSlotStats[i].stream_bytes = 0;
+	replSlotStats[i].total_txns = 0;
+	replSlotStats[i].total_bytes = 0;
 	replSlotStats[i].stat_reset_timestamp = ts;
 }
 

src/backend/replication/logical/logical.c

@@ -1775,21 +1775,20 @@ UpdateDecodingStats(LogicalDecodingContext *ctx)
 	ReorderBuffer *rb = ctx->reorder;
 	PgStat_ReplSlotStats repSlotStat;
 
-	/*
-	 * Nothing to do if we haven't spilled or streamed anything since the last
-	 * time the stats has been sent.
-	 */
-	if (rb->spillBytes <= 0 && rb->streamBytes <= 0)
+	/* Nothing to do if we don't have any replication stats to be sent. */
+	if (rb->spillBytes <= 0 && rb->streamBytes <= 0 && rb->totalBytes <= 0)
 		return;
 
-	elog(DEBUG2, "UpdateDecodingStats: updating stats %p %lld %lld %lld %lld %lld %lld",
+	elog(DEBUG2, "UpdateDecodingStats: updating stats %p %lld %lld %lld %lld %lld %lld %lld %lld",
 		 rb,
 		 (long long) rb->spillTxns,
 		 (long long) rb->spillCount,
 		 (long long) rb->spillBytes,
 		 (long long) rb->streamTxns,
 		 (long long) rb->streamCount,
-		 (long long) rb->streamBytes);
+		 (long long) rb->streamBytes,
+		 (long long) rb->totalTxns,
+		 (long long) rb->totalBytes);
 
 	namestrcpy(&repSlotStat.slotname, NameStr(ctx->slot->data.name));
 	repSlotStat.spill_txns = rb->spillTxns;
@@ -1798,12 +1797,17 @@ UpdateDecodingStats(LogicalDecodingContext *ctx)
 	repSlotStat.stream_txns = rb->streamTxns;
 	repSlotStat.stream_count = rb->streamCount;
 	repSlotStat.stream_bytes = rb->streamBytes;
+	repSlotStat.total_txns = rb->totalTxns;
+	repSlotStat.total_bytes = rb->totalBytes;
 
 	pgstat_report_replslot(&repSlotStat);
+
 	rb->spillTxns = 0;
 	rb->spillCount = 0;
 	rb->spillBytes = 0;
 	rb->streamTxns = 0;
 	rb->streamCount = 0;
 	rb->streamBytes = 0;
+	rb->totalTxns = 0;
+	rb->totalBytes = 0;
 }

src/backend/replication/logical/reorderbuffer.c

@@ -350,6 +350,8 @@ ReorderBufferAllocate(void)
 	buffer->streamTxns = 0;
 	buffer->streamCount = 0;
 	buffer->streamBytes = 0;
+	buffer->totalTxns = 0;
+	buffer->totalBytes = 0;
 
 	buffer->current_restart_decoding_lsn = InvalidXLogRecPtr;
 
@@ -1363,6 +1365,11 @@ ReorderBufferIterTXNNext(ReorderBuffer *rb, ReorderBufferIterTXNState *state)
 		dlist_delete(&change->node);
 		dlist_push_tail(&state->old_change, &change->node);
 
+		/*
+		 * Update the total bytes processed before releasing the current set
+		 * of changes and restoring the new set of changes.
+		 */
+		rb->totalBytes += rb->size;
 		if (ReorderBufferRestoreChanges(rb, entry->txn, &entry->file,
 										&state->entries[off].segno))
 		{
@@ -2363,6 +2370,20 @@ ReorderBufferProcessTXN(ReorderBuffer *rb, ReorderBufferTXN *txn,
 		ReorderBufferIterTXNFinish(rb, iterstate);
 		iterstate = NULL;
 
+		/*
+		 * Update total transaction count and total transaction bytes
+		 * processed. Ensure to not count the streamed transaction multiple
+		 * times.
+		 *
+		 * Note that the statistics computation has to be done after
+		 * ReorderBufferIterTXNFinish as it releases the serialized change
+		 * which we have already accounted in ReorderBufferIterTXNNext.
+		 */
+		if (!rbtxn_is_streamed(txn))
+			rb->totalTxns++;
+
+		rb->totalBytes += rb->size;
+
 		/*
 		 * Done with current changes, send the last message for this set of
 		 * changes depending upon streaming mode.

src/backend/utils/adt/pgstatfuncs.c

@@ -2284,7 +2284,7 @@ pg_stat_get_archiver(PG_FUNCTION_ARGS)
 Datum
 pg_stat_get_replication_slots(PG_FUNCTION_ARGS)
 {
-#define PG_STAT_GET_REPLICATION_SLOT_COLS 8
+#define PG_STAT_GET_REPLICATION_SLOT_COLS 10
 	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
 	TupleDesc	tupdesc;
 	Tuplestorestate *tupstore;
@@ -2335,11 +2335,13 @@ pg_stat_get_replication_slots(PG_FUNCTION_ARGS)
 		values[4] = Int64GetDatum(s->stream_txns);
 		values[5] = Int64GetDatum(s->stream_count);
 		values[6] = Int64GetDatum(s->stream_bytes);
+		values[7] = Int64GetDatum(s->total_txns);
+		values[8] = Int64GetDatum(s->total_bytes);
 
 		if (s->stat_reset_timestamp == 0)
-			nulls[7] = true;
+			nulls[9] = true;
 		else
-			values[7] = TimestampTzGetDatum(s->stat_reset_timestamp);
+			values[9] = TimestampTzGetDatum(s->stat_reset_timestamp);
 
 		tuplestore_putvalues(tupstore, tupdesc, values, nulls);
 	}

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	202104151
+#define CATALOG_VERSION_NO	202104161
 
 #endif

src/include/catalog/pg_proc.dat

@@ -5315,9 +5315,9 @@
   proname => 'pg_stat_get_replication_slots', prorows => '10',
   proisstrict => 'f', proretset => 't', provolatile => 's', proparallel => 'r',
   prorettype => 'record', proargtypes => '',
-  proallargtypes => '{text,int8,int8,int8,int8,int8,int8,timestamptz}',
-  proargmodes => '{o,o,o,o,o,o,o,o}',
-  proargnames => '{slot_name,spill_txns,spill_count,spill_bytes,stream_txns,stream_count,stream_bytes,stats_reset}',
+  proallargtypes => '{text,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
+  proargmodes => '{o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{slot_name,spill_txns,spill_count,spill_bytes,stream_txns,stream_count,stream_bytes,total_txns,total_bytes,stats_reset}',
   prosrc => 'pg_stat_get_replication_slots' },
 { oid => '6118', descr => 'statistics: information about subscription',
   proname => 'pg_stat_get_subscription', prorows => '10', proisstrict => 'f',

src/include/pgstat.h

@@ -548,6 +548,8 @@ typedef struct PgStat_MsgReplSlot
 	PgStat_Counter m_stream_txns;
 	PgStat_Counter m_stream_count;
 	PgStat_Counter m_stream_bytes;
+	PgStat_Counter m_total_txns;
+	PgStat_Counter m_total_bytes;
 } PgStat_MsgReplSlot;
 
 /* ----------
@@ -924,6 +926,8 @@ typedef struct PgStat_ReplSlotStats
 	PgStat_Counter stream_txns;
 	PgStat_Counter stream_count;
 	PgStat_Counter stream_bytes;
+	PgStat_Counter total_txns;
+	PgStat_Counter total_bytes;
 	TimestampTz stat_reset_timestamp;
 } PgStat_ReplSlotStats;
 

src/include/replication/reorderbuffer.h

@@ -618,6 +618,13 @@ struct ReorderBuffer
 	int64		streamTxns;		/* number of transactions streamed */
 	int64		streamCount;	/* streaming invocation counter */
 	int64		streamBytes;	/* amount of data streamed */
+
+	/*
+	 * Statistics about all the transactions sent to the decoding output
+	 * plugin
+	 */
+	int64		totalTxns;		/* total number of transactions sent */
+	int64		totalBytes;		/* total amount of data sent */
 };
 
 

src/test/regress/expected/rules.out

@@ -2068,8 +2068,10 @@ pg_stat_replication_slots| SELECT s.slot_name,
     s.stream_txns,
     s.stream_count,
     s.stream_bytes,
+    s.total_txns,
+    s.total_bytes,
     s.stats_reset
-   FROM pg_stat_get_replication_slots() s(slot_name, spill_txns, spill_count, spill_bytes, stream_txns, stream_count, stream_bytes, stats_reset);
+   FROM pg_stat_get_replication_slots() s(slot_name, spill_txns, spill_count, spill_bytes, stream_txns, stream_count, stream_bytes, total_txns, total_bytes, stats_reset);
 pg_stat_slru| SELECT s.name,
     s.blks_zeroed,
     s.blks_hit,