From e65e14f9b2445b3ca615feb6badc9991f720ac53 Mon Sep 17 00:00:00 2001
From: "andres.suarez" <andres.suarez@supabase.io>
Date: Tue, 18 Aug 2026 14:38:38 +0200
Subject: [PATCH 1/2] feat: add transaction ID age to postgres_exporter Add
 pg_wraparound custom metric to postgres_exporter that tracks the maximum
 transaction ID age across all databases. This enables proactive monitoring of
 wraparound risk before it reaches critical thresholds.

- New queries.yml with max(age(datfrozenxid)) query
- Deployed to /opt/postgres_exporter/ via Ansible

Related: INDATA-1261
---
 ansible/files/queries.yml                    | 9 +++++++++
 ansible/tasks/internal/postgres-exporter.yml | 9 +++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 ansible/files/queries.yml

diff --git a/ansible/files/queries.yml b/ansible/files/queries.yml
new file mode 100644
index 000000000..6a56f9f5a
--- /dev/null
+++ b/ansible/files/queries.yml
@@ -0,0 +1,9 @@
+pg_wraparound:
+  query: |
+    SELECT
+      max(age(datfrozenxid)) AS max_transaction_id_age
+    FROM pg_database
+  metrics:
+    - max_transaction_id_age:
+        usage: GAUGE
+        description: "Max transaction ID age (wraparound risk) across databases"
diff --git a/ansible/tasks/internal/postgres-exporter.yml b/ansible/tasks/internal/postgres-exporter.yml
index 03b16474a..5d876cfe0 100644
--- a/ansible/tasks/internal/postgres-exporter.yml
+++ b/ansible/tasks/internal/postgres-exporter.yml
@@ -39,6 +39,15 @@
     extra_opts: [--strip-components=1]
   become: yes
 
+- name: deploy queries.yml for custom metrics
+  copy:
+    src: files/queries.yml
+    dest: /opt/postgres_exporter/queries.yml
+    owner: root
+    group: root
+    mode: '0644'
+  become: yes
+
 - name: exporter create a service
   template:
     src: files/postgres_exporter.service.j2

From 801c69c09c42502fa6e2bb348c663ff6903881b2 Mon Sep 17 00:00:00 2001
From: andres suarez <andres.suarez@supabase.io>
Date: Tue, 18 Aug 2026 15:29:57 +0200
Subject: [PATCH 2/2] Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
---
 ansible/files/queries.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ansible/files/queries.yml b/ansible/files/queries.yml
index 6a56f9f5a..43024c3de 100644
--- a/ansible/files/queries.yml
+++ b/ansible/files/queries.yml
@@ -6,4 +6,4 @@ pg_wraparound:
   metrics:
     - max_transaction_id_age:
         usage: GAUGE
-        description: "Max transaction ID age (wraparound risk) across databases"
+        description: "Max transaction ID age (in XIDs; wraparound risk) across databases"