feat: add HostRaidDegraded

rules/md.yml

@@ -19,3 +19,11 @@ groups:
         annotations:
           summary: "Host RAID disk failure (instance {{ $labels.instance }})"
           description: "At least one device in RAID array on {{ $labels.instance }} failed. Array {{ $labels.md_device }} needs attention and possibly a disk swap\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
+      - alert: HostRaidDegraded
+        expr: node_md_disks_required - ignoring (state) (node_md_disks{state="active"}) > 0
+        for: 15m
+        labels:
+          severity: page
+        annotations:
+          summary: "Host RAID is degraded (instance {{ $labels.instance }})"
+          description: "Host RAID array '{{ $labels.device }}' at {{ $labels.instance }} is in degraded state due to one or more disks failures. Number of spare drives is insufficient to fix issue automatically."