Idle & Underutilized EC2 / RDS Instances
Est. Savings: $8,500/mo Observation Dev/QA environments run 24/7. Several RDS instances are over-provisioned (<10% CPU) and Multi-AZ in non-prod.
Action Implement tag-based scheduling (off 7 PM - 7 AM, weekends). Downsize non-prod RDS to Single-AZ.