evaluationWindow

The evaluation window that the alarm uses to select the range of metric data that it evaluates. Specify either a sliding window or a wall clock window. If you omit this parameter, the alarm uses a sliding window.

A sliding window advances each time the alarm is evaluated, forming a rolling time window. A wall clock window aligns the evaluated range to fixed clock boundaries, such as the top of the hour or the start of the day.

You can use EvaluationWindow with any type of metric alarm except alarms that are based on a PromQL query.

For more information, see Alarm evaluation windows in the CloudWatch User Guide.