Amazon CloudWatch Alarms Adds Wall Clock Evaluation Windows for Calendar-Aligned Monitoring

CloudWatch Alarms introduced wall clock evaluation windows to align metric alarm evaluations with fixed calendar periods like hours, days, or weeks, improving monitoring accuracy for scheduled workloads.

By Noah Ellis · Editorial pseudonym · 2026-08-07 · 1 min read

AI-ASSISTED REPORTING · RETROSPECTIVE ARCHIVE

Retrospective edition: 2026-08-07. Source published: 2026-08-07. Added to this archive: 2026-11-03. This briefing was prepared later from the linked announcement; it was not published on this website on the historical edition date.

This feature helps avoid false alarms caused by sliding windows crossing calendar boundaries, for example, by evaluating daily backups strictly within each calendar day. Customers can set evaluation windows aligned to their time zones, with automatic handling of daylight saving time changes.

Available in all AWS Regions except specified Middle East locations, wall clock evaluation windows complement existing sliding window alarms, offering a choice to better match monitoring to business schedules and reduce alert noise related to timing irregularities.

Source & further reading

Amazon CloudWatch Alarms now supports wall clock evaluation windows ↗

Source published 2026-08-07. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.