--- title: One canary rule, three systems to reconcile | daily.dev description: Enforcing an engineering standard like 'every critical service must use a canary rollout' requires reconciling evidence across three disconnected systems: the... canonical: https://daily.dev/posts/one-canary-rule-three-systems-to-reconcile-8zhacdbbe twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: One canary rule, three systems to reconcile | daily.dev og:description: Enforcing an engineering standard like 'every critical service must use a canary rollout' requires reconciling evidence across three disconnected systems: the... og:url: https://daily.dev/posts/one-canary-rule-three-systems-to-reconcile-8zhacdbbe og:image: https://api.daily.dev/og/posts/8zHacDbbE.png og:image:alt: One canary rule, three systems to reconcile 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. # One canary rule, three systems to reconcile **[Earthly](https://daily.dev/sources/earthly)** · 5 min read · 0 upvotes · 0 comments ## Summary Enforcing an engineering standard like 'every critical service must use a canary rollout' requires reconciling evidence across three disconnected systems: the application repo, the Helm/deployment configuration repo, and a service criticality catalog. The piece walks through mapping services to their configs, distinguishing declared config from proven deployment behavior, and rolling out enforcement gradually (visibility, PR feedback, then blocking) with a documented exception process. It presents Earthly Lunar as a platform that collects repository and CI evidence, evaluates guardrails, and helps teams manage this lifecycle, including handling new services as they appear and drafting custom checks via AI agent skills. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Trust But Canary: Configuration Safety at Scale](https://daily.dev/posts/trust-but-canary-configuration-safety-at-scale-piwqqvwtj) · Facebook Engineering · 0 upvotes · 0 comments - [CI/CD in the age of AI, part 2: Deployments](https://daily.dev/posts/ci-cd-in-the-age-of-ai-part-2-deployments-pjhqy8pce) · Neciu Dan · 0 upvotes · 0 comments - [Amazon ECS now supports built-in Linear and Canary deployments](https://daily.dev/posts/amazon-ecs-now-supports-built-in-linear-and-canary-deployments-a3ojrswon) · AWS · 0 upvotes · 0 comments - [A live Kubernetes cluster can still have an ownership gap](https://daily.dev/posts/a-live-kubernetes-cluster-can-still-have-an-ownership-gap-by8o4s5rz) · The New Stack · 1 upvotes · 0 comments - [Canary rollouts: upgrade models in production without downtime](https://daily.dev/posts/canary-rollouts-upgrade-models-in-production-without-downtime-ns4sjyphf) · Together AI · 0 upvotes · 0 comments --- Tags: [#cicd](https://daily.dev/tags/cicd), [#platform-engineering](https://daily.dev/tags/platform-engineering) [View this post on daily.dev](https://daily.dev/posts/one-canary-rule-three-systems-to-reconcile-8zhacdbbe) ```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":"One canary rule, three systems to reconcile","url":"https://daily.dev/posts/one-canary-rule-three-systems-to-reconcile-8zhacdbbe","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/one-canary-rule-three-systems-to-reconcile-8zhacdbbe"},"datePublished":"2026-09-29T19:15:38.814Z","dateModified":"2026-09-29T19:16:04.867Z","description":"Enforcing an engineering standard like 'every critical service must use a canary rollout' requires reconciling evidence across three disconnected systems: the...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/02dee0cec73027e93576c03387132116?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/02dee0cec73027e93576c03387132116?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Earthly","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":"Earthly","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/139a6e6902684ea1aa97ca01c0c8c92e","url":"https://daily.dev/sources/earthly"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/one-canary-rule-three-systems-to-reconcile-8zhacdbbe","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"cicd,platform-engineering","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Earthly","item":"https://daily.dev/sources/earthly"},{"@type":"ListItem","position":3,"name":"One canary rule, three systems to reconcile"}]} ```