13. Last-Minute Tips

CloudWatch

≠ **CloudTrail** (CW = metrics/logs, CT = API audit)

Multi-AZ

for HA ≠ **Read Replica** for scale

Glacier

retrievals: instant (Instant Retrieval) vs hours (Flexible/Deep)

HTTP API

preferred over **REST API** for cost-sensitive

OAC

preferred over **OAI** for new CloudFront