v-m: alerts: Add Longhorn alerts

victoria-metrics/alerts.yml

@@ -148,3 +148,14 @@ groups:
     expr: >-
       {__name__=~"collectd_.*_temperature", sensors!~"i350bb.*"} > 80
     for: 10m
+
+- name: Longhorn
+  rules:
+  - alert: Degraded Volumes
+    expr: >-
+      count(longhorn_volume_robustness==2) > 0
+    for: 1h
+  - alert: Faulted Volumes
+    expr: >-
+      count(longhorn_volume_robustness==3) > 0
+    for: 5m