Modify monitoring condition for Kernel differences.

cookbooks/prometheus/files/etc/prometheus.d/alerts/node_exporter.yml

@@ -176,8 +176,8 @@ groups:
       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: HostKernelVersionDeviations
-    expr: count(sum(label_replace(node_uname_info, "kernel", "$1", "release", "([0-9]+.[0-9]+.[0-9]+).*")) by (kernel)) > 1
-    for: 5m
+    expr: count(sum(label_replace(node_uname_info, "kernel", "$1", "release", "([0-9]+.[0-9]+.[0-9]+).*")) by (kernel)) > 2
+    for: 24h
     labels:
       severity: warning
     annotations: