Steps to reproduce:

1. Monitor a proxmox node.
2. Create a VM a test VM ( let's say VM#999 )
3. Wait until it is populated in Zabbix items/ monitor
4. disable the monitoring for this this VM
5. reboot the VM and wait less than 10 min and shut it down - never to turn it on again.
6. Zabbix will complain that the VM is rebooted ( uptime <10min)
7. Close the info
8. Zabbix will complain that the VM is rebooted ( uptime <10min) 
9. Close the issue
10. Zabbix will complain that the VM is rebooted  ( uptime <10min) 
11. ...

Result:
It should check also if the VM uptime is different from the previous one - if it is the same - do not pop the alarm any longer
Expected:
Once you close the triggered alarm - never bother you again until enable the VM monitoring

AND

Once you closed the alarm it should not trigger if the uptime = uptime.last