--- title: Amazon CloudWatch now supports warm-up periods for alarms description: Amazon CloudWatch now supports configurable warm-up periods for metric and log alarms, delaying evaluation for a set time after alarm creation. This prevents... canonical: https://daily.dev/posts/amazon-cloudwatch-now-supports-warm-up-periods-for-alarms-m0czfjzmy twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Amazon CloudWatch now supports warm-up periods for alarms | daily.dev og:description: Amazon CloudWatch now supports configurable warm-up periods for metric and log alarms, delaying evaluation for a set time after alarm creation. This prevents... og:url: https://daily.dev/posts/amazon-cloudwatch-now-supports-warm-up-periods-for-alarms-m0czfjzmy og:image: https://api.daily.dev/og/posts/M0CZfjzmy.png og:image:alt: Amazon CloudWatch now supports warm-up periods for alarms og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Amazon CloudWatch now supports warm-up periods for alarms **[AWS](https://daily.dev/sources/aws)** · 2 min read · 0 upvotes · 0 comments ## Summary Amazon CloudWatch now supports configurable warm-up periods for metric and log alarms, delaying evaluation for a set time after alarm creation. This prevents noisy alerts caused by missing data when a newly deployed resource or service hasn't started publishing metrics yet. Users can set a fixed wait duration (1 to 2,880 minutes) via the WarmUpConfiguration parameter, or let CloudWatch automatically begin evaluation once enough data fills the evaluation window. The feature is available in all AWS Regions offering CloudWatch at no extra cost. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I stop CloudWatch alarms from firing when a new service hasn't started publishing metrics yet? Configure a warm-up period on the alarm using the WarmUpConfiguration parameter when creating or updating it. You can set a duration from 1 to 2,880 minutes (2 days) to delay evaluation, and by default the alarm ends warm-up early once enough data fills its evaluation window, or you can require it to wait the full duration. _daily.dev surfaces AWS release notes like this for teams tuning CI/CD alarm setups._ ### What did CloudWatch alarms do before warm-up periods existed when metrics were missing during startup? CloudWatch evaluated the alarm immediately using its configured treat-missing-data setting, even if the underlying resource had not yet begun reporting metrics. For newly deployed applications or services that take time to emit data, this could cause the alarm to transition state and trigger unnecessary notifications during startup. _Engineers debugging noisy on-call pages track alarm behavior changes like this on daily.dev._ ### Does adding a CloudWatch alarm warm-up period cost extra? No, warm-up periods are available in all AWS Regions where CloudWatch is offered at no additional charge beyond standard CloudWatch alarm pricing. _Teams evaluating AWS monitoring costs follow pricing-relevant changes like this on daily.dev._ ## Similar posts on daily.dev - [Amazon CloudWatch introduces organization-wide EC2 detailed monitoring enablement](https://daily.dev/posts/amazon-cloudwatch-introduces-organization-wide-ec2-detailed-monitoring-enablement-9ouq5gtr6) · AWS · 0 upvotes · 0 comments - [Amazon MWAA adds built-in monitoring with Amazon CloudWatch](https://daily.dev/posts/amazon-mwaa-adds-built-in-monitoring-with-amazon-cloudwatch-eodpjw20y) · AWS · 0 upvotes · 0 comments - [Amazon CloudWatch now supports resource tags when monitoring vended metrics](https://daily.dev/posts/amazon-cloudwatch-now-supports-resource-tags-when-monitoring-vended-metrics-xaso74a66) · AWS · 1 upvotes · 0 comments --- Tags: [#aws](https://daily.dev/tags/aws), [#devops](https://daily.dev/tags/devops), [#observability](https://daily.dev/tags/observability), [#monitoring](https://daily.dev/tags/monitoring) [View this post on daily.dev](https://daily.dev/posts/amazon-cloudwatch-now-supports-warm-up-periods-for-alarms-m0czfjzmy) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Amazon CloudWatch now supports warm-up periods for alarms","url":"https://daily.dev/posts/amazon-cloudwatch-now-supports-warm-up-periods-for-alarms-m0czfjzmy","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/amazon-cloudwatch-now-supports-warm-up-periods-for-alarms-m0czfjzmy"},"datePublished":"2026-09-01T12:07:40.103Z","dateModified":"2026-09-01T12:08:04.489Z","description":"Amazon CloudWatch now supports configurable warm-up periods for metric and log alarms, delaying evaluation for a set time after alarm creation. This prevents...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/2587ee7271b19b73b7c9d67f739e4290?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/2587ee7271b19b73b7c9d67f739e4290?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"AWS","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"AWS","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/aws","url":"https://daily.dev/sources/aws"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/amazon-cloudwatch-now-supports-warm-up-periods-for-alarms-m0czfjzmy","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"aws,devops,observability,monitoring","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"AWS","item":"https://daily.dev/sources/aws"},{"@type":"ListItem","position":3,"name":"Amazon CloudWatch now supports warm-up periods for alarms"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/amazon-cloudwatch-now-supports-warm-up-periods-for-alarms-m0czfjzmy#faq","mainEntity":[{"@type":"Question","name":"How do I stop CloudWatch alarms from firing when a new service hasn't started publishing metrics yet?","acceptedAnswer":{"@type":"Answer","text":"Configure a warm-up period on the alarm using the WarmUpConfiguration parameter when creating or updating it. You can set a duration from 1 to 2,880 minutes (2 days) to delay evaluation, and by default the alarm ends warm-up early once enough data fills its evaluation window, or you can require it to wait the full duration. daily.dev surfaces AWS release notes like this for teams tuning CI/CD alarm setups."}},{"@type":"Question","name":"What did CloudWatch alarms do before warm-up periods existed when metrics were missing during startup?","acceptedAnswer":{"@type":"Answer","text":"CloudWatch evaluated the alarm immediately using its configured treat-missing-data setting, even if the underlying resource had not yet begun reporting metrics. For newly deployed applications or services that take time to emit data, this could cause the alarm to transition state and trigger unnecessary notifications during startup. Engineers debugging noisy on-call pages track alarm behavior changes like this on daily.dev."}},{"@type":"Question","name":"Does adding a CloudWatch alarm warm-up period cost extra?","acceptedAnswer":{"@type":"Answer","text":"No, warm-up periods are available in all AWS Regions where CloudWatch is offered at no additional charge beyond standard CloudWatch alarm pricing. Teams evaluating AWS monitoring costs follow pricing-relevant changes like this on daily.dev."}}]} ```