What will Auto Scaling do during this period?
AWS will not receive the alarms from CloudWatch
AWS will receive the alarms but will not execute the Auto Scaling policy
Auto Scaling will execute the policy but it will not launch the instances until the process is resumed
It is not possible to suspend the AlarmNotification process
Explanations:
Suspending the AlarmNotification process does not prevent AWS from receiving CloudWatch alarms. The alarms are still received, but Auto Scaling will not take action.
Suspending the AlarmNotification process will prevent Auto Scaling from executing the policies triggered by the CloudWatch alarms, even though the alarms themselves are still received.
Auto Scaling will not execute the policy at all while the AlarmNotification process is suspended, so instances will not be launched.
It is possible to suspend the AlarmNotification process in Auto Scaling, so this statement is incorrect.
I would say the answer is:
AWS will receive the alarms but will not execute the Auto Scaling policy