diff --git a/monitoring/configuration/pg-exporter-queries.yml b/monitoring/configuration/pg-exporter-queries.yml
index deacdbf..bb1d732 100644
--- a/monitoring/configuration/pg-exporter-queries.yml
+++ b/monitoring/configuration/pg-exporter-queries.yml
@@ -273,3 +273,12 @@ pg_tb_stats:
         usage: "GAUGE"
         description: "Number of messages for the given pubsub topic"
 
+pg_tb_messages:
+  query: |
+    SELECT
+      COUNT(ID)
+    FROM messages
+  metrics:
+    - count:
+        usage: "GAUGE"
+        description: "Row count in `messages` table"