Amazon CloudWatch Now Supports Warm-Up Periods for Alarms
Amazon CloudWatch introduces warm-up periods for metric and log alarms, allowing users to delay alarm evaluation for a configurable time after creation. This feature significantly reduces false positives and notification noise during resource startup by preventing alarms from triggering on missing data. On-call engineers and teams deploying new services via CI/CD pipelines will benefit from more accurate alerting, avoiding unnecessary pages while services initialize. Users can set a warm-up duration from 1 to 2,880 minutes, with options to evaluate early upon sufficient data or wait the full period, available in all AWS Regions at no additional charge.
Features (1) ›
- Configure Warm-Up Periods for CloudWatch Alarms
CloudWatch now allows users to specify a warm-up period for metric and log alarms, delaying their evaluation until a resource has started up and begun publishing metrics. This helps prevent alarms from transitioning state and triggering actions due to missing data during the initial startup phase of newly deployed applications or services. The warm-up duration can be set between 1 and 2,880 minutes, with flexible options for evaluation to begin automatically when enough data is available or after the full duration.
https://aws.amazon.com/about-aws/whats-new/2026/08/amazon-cloudwatch-alarms-warmup-period
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