v-m/alerts: Add alerts for PostgreSQL WAL archiver

victoria-metrics/alerts.yml

@@ -89,6 +89,24 @@ groups:
       - ignoring (instance) group_right (scope) (patroni_xlog_replayed_location != 0)
       > 10240
     for: 10m
+  - alert: WAL archive process failed
+    expr: >-
+      pg_stat_archiver_failed_count > 0
+    annotations:
+      summary: The archiver process failed for one or more WAL segments
+      description: >-
+        Check the WAL segment archiver configuration and confirm that WAL
+        segments are being backed up correctly.
+  - alert: No recent WAL archives
+    expr: >-
+      pg_stat_archiver_last_archive_age > 3600
+    annotations:
+      summary: The last successful WAL segment backup was over 1h ago
+      description: >-
+        The WAL archiver process has not run successfully for over an hour.
+        Ensure the WAL backup process is configured correctly and the backup
+        target is online and healthy.
+
 
 - name: Temperature
   rules: