title: compute.instances.host Error an instance during
body: <p>In the operations history of my compute engine project, my machines all have an operation listed as "Automatically migrate an instance (compute.instances.automaticRestart)". They are all on the same zone, using the same debian template.</p>
  
  <p>I suppose that their was some maintenance on the plateform, which is fine for me if the OS doesn't reboot.</p>
  
  <p>Unfortunately two machines suffered a reboot. The operations history listed the operation as  "compute.instances.hostError an instance" (compute.instances.hostError). 
  In addition Syslog doesn't suggest a clean shutdown. </p>
  
  <p>Is there anything I should/can do to prevent such problem?</p>
  
  <p>edit : We are europe-west1-b and all servers have the setting : On host maintenance to Migrate VM instance</p>