diff --git a/hosts/monitoring-3/rules.yml b/hosts/monitoring-3/rules.yml
index 26d45b2..95ed038 100644
--- a/hosts/monitoring-3/rules.yml
+++ b/hosts/monitoring-3/rules.yml
@@ -9,13 +9,6 @@ groups:
     annotations:
       summary: "Endpoint {{ $labels.instance }} down"
       description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 1 minutes."
-  - alert: InstanceUptime
-    expr: time() - node_boot_time_seconds{job="node-exporter"} >= 7776000
-    labels:
-      severity: warning
-    annotations:
-      summary: "Uptime of {{ $labels.instance }} more than 90 days"
-      description: "The last reboot of {{ $labels.instance }} was more than 90 days ago"
   - alert: InstanceConfigNotSync
     expr: nixos_current_system_is_sync{} == 0
     for: 2h
@@ -48,3 +41,11 @@ groups:
     annotations:
       summary: "Event instance {{ $labels.instance }} down"
       description: "{{ $labels.instance }} has been down for more than 2 hours."
+  - alert: KernelChanged
+    expr: nixos_current_system_kernel_is_booted_system_kernel{job="nixos-exporter"} == 0
+    for: 2h
+    labels:
+      severity: warning
+    annotations:
+      summary: "Kernel of {{ $labels.instance }} changed"
+      description: "The Kernel {{ $labels.instance }} booted with, isn't the target Kernel. A reboot may be required."