- Missing EC2 memory: use the CloudWatch agent.
- Known log pattern alarm: metric filter plus alarm.
- Continuous log routing: subscription filter.
- API principal investigation: CloudTrail.
- Resource-state timeline: AWS Config.
- Seasonal threshold: anomaly detection plus hard safety alarm.
- Duplicate pages: composite alarm while retaining component alarms.
- Dynamic fleet: Metrics Insights or an automatically aggregated metric.
- Cross-account operations: cross-account observability plus a separate protected archive.