--- title: "Preventing Revenue Loss With Real-Time A/B Test Monitoring" url: https://daily.dev/posts/preventing-revenue-loss-with-real-time-a-b-test-monitoring-ly7piluxu source_url: https://medium.com/expedia-group-tech/preventing-revenue-loss-with-real-time-a-b-test-monitoring-605698817457 type: article source: "Expedia Group Tech" published: 2025-06-03T12:28:17.866Z updated: 2025-06-03T12:28:43.862Z tags: ["kafka", "apache-flink", "real-time-analytics", "ab-testing"] reading_time: 12 upvotes: 0 comments: 0 language: 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. # Preventing Revenue Loss With Real-Time A/B Test Monitoring **[Expedia Group Tech](https://daily.dev/sources/expedia)** · 12 min read · 0 upvotes · 0 comments ## Summary Expedia Group built a real-time A/B test monitoring system called EGTnL Circuit Breaker using Apache Flink to prevent revenue loss from poorly performing experiments. The system addresses the critical gap in monitoring during the first 24 hours of an experiment by aggregating user exposures and metrics in real-time, handling complex challenges like bot traffic filtering and distinct user tracking. The solution processes data through three stages: filtering, user state collection, and aggregation, enabling automatic detection and suspension of underperforming tests within minutes. In its first 6 months, the system monitored 95% of A/B tests, detected 36% of experiment issues automatically, and prevented significant revenue loss including stopping one experiment with a -39% conversion impact. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 0 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments - [CNCF Unveils Schedule for KubeCon \+ CloudNativeCon Europe 2026](https://daily.dev/posts/cncf-unveils-schedule-for-kubecon-cloudnativecon-europe-2026-ikhcoa5cb) · CNCF · 2 upvotes · 0 comments - [CNCF Debuts KubeCon \+ CloudNativeCon Japan 2026 Schedule](https://daily.dev/posts/cncf-debuts-kubecon-cloudnativecon-japan-2026-schedule-xp5pyudub) · CNCF · 1 upvotes · 0 comments --- Tags: [#kafka](https://daily.dev/tags/kafka), [#apache-flink](https://daily.dev/tags/apache-flink), [#real-time-analytics](https://daily.dev/tags/real-time-analytics), [#ab-testing](https://daily.dev/tags/ab-testing) [View this post on daily.dev](https://daily.dev/posts/preventing-revenue-loss-with-real-time-a-b-test-monitoring-ly7piluxu)