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this instance is optimally sized for the workload.

This instance should be upsized to a more optimal instance family. This will improve the workload's performance and reduce risk.

If the workload can be moved to larger instance in a different family and still reduce cost, this then becomes a Modernize recommendation. e.g. t2.medium-Linux to m3.medium-Linux

This instance should be upsized to an instance within the same instance family. The hosted workload needs an instance with more CPU and\or memory resources.

e.g. r3.large to r4.xlarge, both are in the "Memory Optimized r" instance family.

This instance should be downsized to an instance belonging to an instance family that more closely suits your workload's utilization.

When you downsize, CPU and\or memory will be decreased to better suit your workloads. Utilization will improve with no impact on performance. This will save you money. e.g. d2.medium-Linux to m4.medium-Linux

This instance should be downsized to an instance within the same instance family.

As indicated above, CPU and\or memory will be decreased to better suit your workloads. Utilization will improve with no impact on performance. This will save you money. e.g. m3.large-Linux to m3.small-Linux

ThisAuto Scaling group or VM Scale Set should be downscaled to decrease the compute capacity by adjusting the minimum group size.