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Feature flags with strategy constraints [Updated with note, 2023]

Blog post from Unleash

Post Details
Company
Date Published
Author
Ivar Ă˜sthus
Word Count
585
Company Posts That Month
10
Language
-
Hacker News Points
-
Post removed?
No
Summary

Feature flags with strategy constraints enhance the efficiency of using feature flags within developer workflows by allowing different rollout configurations across environments, such as enabling features for all users in QA but only for a select group in production. This approach eliminates the need for custom strategies or environment-specific prefixes in feature flag names. To utilize these constraints, developers must first upgrade and configure their client SDKs for environment-specific initializations, which are supported in various languages including Node.js, Java, Python, and Go. Strategy constraints enable the definition of activation strategies that apply only under specific conditions, such as environment, country, or customer ID, allowing for flexible and controlled feature deployment. This method supports seamless rollouts without custom activation strategies, as developers can specify constraints like a "100% rollout in development" alongside a "50% rollout in production."

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