DEV-541: postgres zombies alert

templates/prometheus/config/prometheus/alert.rules.j2

@@ -350,3 +350,14 @@ groups:
       summary: "Elasticsearch health status is not green. Please Check"
       description: "Alert for Elasticsearch health status"
 
+  - alert: postgres backup zombies
+    expr: 100 - ((node_filesystem_avail_bytes{instance=~"{{ stage }}-postgres-01.smardigo.digital",job=~"node-exporter",device='/dev/mapper/vg.postgres_backup-lv.postgres_backup'} * 100) / node_filesystem_size_bytes{instance=~"{{ stage }}-postgres-01.smardigo.digital",job=~"node-exporter",device='/dev/mapper/vg.postgres_backup-lv.postgres_backup'}) > 10
+    for: 2h
+    labels:
+      severity: critical
+    annotations:
+      identifier: '{{ '{{' }} $labels.instance {{ '}}' }}'
+      summary: "postgres backup zombies, have not been deleted"
+      description: "postgres backup zombies, have not been deleted"
+
+