- Introduces wall‑clock evaluation windows for CloudWatch metric alarms, letting alarms align to fixed calendar boundaries (e.g., top of the hour, midnight).
- Allows specifying time zones with automatic DST handling, preventing false alarms caused by rolling‑window boundaries.
- Available in all AWS regions except Middle East (UAE) and Middle East (Bahrain); documented in the CloudWatch User Guide.
Amazon CloudWatch Alarms now supports wall clock evaluation windows
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