Ensure the number of private gateways is within the AWS limit for each region

Checks the number of private gateways in each AWS region in your account is not close to the AWS imposed limit. If the number of gateways approaches the limit in a particular VPC, you will receive an alert. As per AWS recommendation Virtual private gateway per region limit is 5. This policy will trigger an alert if Virtual private gateway per region reached 80% (i.e. 4) of resource availability limit allocated.