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AWS Certified Solutions Architect - Associate · AWS
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'On the first day of every month at midnight' = Scheduled scaling policy
By configuring a scheduled scaling policy, the EC2 Auto Scaling group can proactively launch additional EC2 instances before the CPU utilization peaks to 100%. This will ensure that the application can handle the workload during the month-end financial calculation batch, and avoid any disruption or downtime. Configuring a simple scaling policy based on CPU utilization or adding Amazon CloudFront distribution or Amazon ElastiCache will not directly address the issue of handling the monthly peak workload.
If the scaling were based on CPU or memory, it requires a certain amount of time above that threshhold, 5 minutes for example. That would mean the CPU would be at 100% for five minutes.