Basic metrics and alarms tell you problems after they happen. When CPU hits 90%, the alarm rings, but users have already experienced slowness. Monitoring's next evolution splits two directions. One goes deeper — from VM-level to per-container, to application SLO. The other goes ahead — detecting with synthetic traffic before users hit it, and using ML's learned baseline instead of static thresholds to catch subtle anomalies. CloudWatch's advanced features — Container Insights, Synthetics, Anomaly Detection, Dashboards — stand exactly on these "deeper, ahead" axes.