Provision platform alarms

[cpcundill]

Overview

Provision additional platform CloudWatch alarms to improve alerting for scalability.

Additional alarms are needed for:

• RDS cluster CPU alarm for Reader instances for the platform
• ECS cluster alarm for CPU for the platform ECS service
• ECS cluster alarm for memory for the platform ECS service
• Canaries check intervals to be smaller more like 10s

Acceptance Criteria/Tests

Tech Approach