Availability policy
Google will perform maintenance on its infrastructure, which may require your VM instances to be moved to another host. GCE will live migrate your instance if the instance's availability policy was set to use this feature. As a result, your applications will not suffer from any downtime but may witness some performance degradation. Live migration is the default setting for an instance.
Alternatively, if you have built-in high availability at the application level, then you may wish to change this setting to terminate and restart on another host. This setting means that your instance would be shut down cleanly and restarted on a fresh host. Google will report any maintenance issues and how it affects your instance depending ...
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