From a85568d06abc6e04764673c6c31511a7f536814c Mon Sep 17 00:00:00 2001
From: Nada Shaban <nadashaban971@gmail.com>
Date: Thu, 7 May 2026 20:16:30 +0300
Subject: [PATCH] Add wal_fpi_bytes to wal_stats metric

---
 internal/metrics/metrics.yaml | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/internal/metrics/metrics.yaml b/internal/metrics/metrics.yaml
index e358a898af..10d0245fc6 100644
--- a/internal/metrics/metrics.yaml
+++ b/internal/metrics/metrics.yaml
@@ -4137,6 +4137,27 @@ metrics:
                     wal_sync_time
                 from
                     pg_stat_wal, io
+            19: |-
+                with io as (
+                  select 
+                    sum(writes) as wal_write, 
+                    sum(fsyncs) as wal_sync,
+                    sum(round(write_time::numeric, 3)::int8) as wal_write_time,
+                    sum(round(fsync_time::numeric, 3)::int8) as wal_sync_time
+                  from pg_stat_io where "object" = 'wal')
+                select /* pgwatch_generated */
+                    (extract(epoch from now()) * 1e9)::int8 as epoch_ns,
+                    wal_records,
+                    wal_fpi,
+                    (wal_bytes / 1024)::int8 as wal_bytes_kb,
+                    wal_fpi_bytes,
+                    wal_buffers_full,
+                    wal_write,
+                    wal_sync,
+                    wal_write_time,
+                    wal_sync_time
+                from
+                    pg_stat_wal, io
     datfrozenxid:
         description: >
             This metric collects information about the database frozen transaction ID.