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Software Engineering•December 26, 2023•9 min read

Feature Flags: Controlled Feature Rollouts

Feature flags enable controlled rollouts, A/B testing, and instant rollbacks without deployments.

#feature-flags#release-management#a-b-testing#devops

Feature flags decouple deployment from release. Release features to specific users or percentages. Roll back instantly without redeploying. Enable A/B testing measuring feature impact.

Implementation Patterns

Boolean flags enable/disable features. Percentage rollouts test at scale. User targeting enables beta testing. Configuration flags adjust behavior.

  • Start with simple boolean flags
  • Implement percentage rollouts for gradual releases
  • Use user targeting for beta programs
  • Track flag usage for cleanup
  • Document flag purposes and ownership

Flag Management

Remove flags after full rollout. Track flag usage preventing stale flags. Document flag purposes for team understanding. Use flag management tools for complex needs.

Tags

feature-flagsrelease-managementa-b-testingdevopsdeployment

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