Investigate how autoscaling works in our ECS deployments

[hellais]

We would like to have the autoscaling groups adjust the number of service instance and ec2 instances to factor for increased load or usage.

We should investigate how we have it setup at the moment and evaluate if some tuning to the autoscaling group is needed in order for it to dynamically adjust.

See:

• https://docs.aws.amazon.com/autoscaling/ec2/userguide/scaling-overview.html
• https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scale-based-on-demand.html