alerting: also alert on reboots of snmp devices

files/alerting_rules.yml

@@ -64,3 +64,12 @@ groups:
         annotations:
           summary: A switch port changed it's state {{ $value }}x time
           description: "For some reason a switch port changed it's state\n LABELS = {{ $labels }}"
+
+      - alert: SNMPNodeRebooted
+        expr: (sysUpTime / 100) <= (60 * 60 * 2)
+        for: 0m
+        labels:
+          severity: critical
+        annotations:
+          summary: A snmp node rebooted in the last 2 hours (instance {{ $labels.instance }})
+          description: "The uptime of a snmp node changed in the last two hours. VALUE = {{ $value }}\n LABELS = {{ $labels }}"