Composite Alarms with AND/OR/NOT logical expressions, anomaly detection with ML dynamic band, alarm actions with Lambda and SSM, and alarm states with missing data treatment.
Logs Insights queries to aggregate errors by endpoint, extract fields with parse, timeseries with bin(), auto-discovered fields, and reusable saved queries.
Custom metrics via EMF in Lambda without API calls, EMF document structure, EMF vs PutMetricData, high-resolution metrics, Powertools Metrics, and high-cardinality pitfalls.
Global Tables v2019 multi-region, last-writer-wins conflict resolution, MREC vs MRSC, rWRU/rWCU cost, DAX with Global Tables, and regional write patterns.
Atomic TransactWriteItems with multiple entities, ConditionExpression for optimistic locking, 2x transaction cost, ClientRequestToken for idempotency, and isolation levels.