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Amazon CloudWatch Alarms now supports wall clock evaluation windows

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This article announces wall clock evaluation windows for Amazon CloudWatch metric alarms, enabling customers to align alarm evaluations to fixed calendar boundaries.

  • Aligns alarm evaluations to fixed calendar boundaries like hourly, daily, or weekly intervals
  • Eliminates false alarms when events cross rolling window boundaries
  • Evaluates each calendar period independently for scheduled workloads
  • Supports timezone specification with automatic daylight saving time handling
  • Available in all AWS Regions except Middle East (UAE) and Middle East (Bahrain)

Wall clock evaluation windows provide more accurate monitoring for business-aligned and scheduled workloads by preventing false alarms from boundary-crossing events.



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