O'Reilly eBook

Managing Feature Flags

In this book, we’ll look at the history of feature flags and, more importantly, learn how teams can successfully apply these techniques. We’ll examine different types of feature flags and what makes them different. We’ll see some critical code-level techniques to keep our feature flagging code manageable, and we’ll explore how to keep the number of flags in our code base to a manageable level. 

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Deliver Software Faster in Small Increments Like Top Companies

Top companies have learned that feature flags offer a powerful way to turn code ideas into immediate outcomes without breaking anything in the meantime. Download the eBook to learn more.

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Download this eBook to learn:

In this eBook, learn how to successfully implement feature flags, aka toggles, flips, gates, or switches, to accelerate software delivery and trunk-based development. 

  • Use feature flag management to determine user/feature interactions
  • Examine several cases involving feature flags
  • Learn techniques to ensure that feature-flagged code is readable
  • Explore trends driving continuous delivery and experimentation
  • And more! Download the free eBook today
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Use Cases

At a high level, feature flags accelerate development by powering the following use cases: 

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Continuous Delivery

The only way to ensure that a shared branch is always releasable is to hide unfinished features behind flags that are turned off by default. Otherwise, Continuous Delivery can turn into continuous failure. 

Testing In Production

Feature flags allow teams to perform functional and performance tests directly on production with a subset of customers. This is a secure and performant way of understanding how a new feature will scale with customers. 

Kill A Feature

By having a feature enhancements behind a flag, you can not only roll it out to subsets of customers, but you also can remove it from all customers if it is causing problems to customer experience. This idea of “killing” a feature is better than having to do an emergency fix or a code rollback.

Migrating To Microservices

Microservices is the practice of breaking up a huge, monolithic release into many discrete services that you can roll out in independent release schedules.


You can use feature flags to permanently tie features to subscription types. For instance, a feature could be available to every customer as part of a free trial, but is gated afterward by the customer buying a premium subscription.

Feature Management is Crucial

Feature management offers developers the flexibility to control the release of new functionalities through feature toggles. Feature toggles, also known as feature flags, are versatile tools that enable teams to manage features effectively. With feature toggle implementation, developers can streamline feature rollout processes, ensuring smooth transitions and minimizing the risk associated with new releases. Utilizing feature management tools enhances the efficiency of feature flag deployment, empowering teams to adjust feature availability dynamically based on user feedback and performance metrics.

Feature toggle systems serve as the backbone of feature management strategies, providing developers with the ability to control feature flags rollout seamlessly. By employing feature flag management tools, teams can orchestrate complex feature deployments with precision, enabling incremental releases and A/B testing. These tools offer a centralized platform for monitoring and managing feature flags across development, staging, and production environments, facilitating collaboration among team members and ensuring consistent feature behavior across different deployment scenarios.

Set Up Effective Feature Management

Split’s robust feature flag management tools offer comprehensive functionalities for controlling feature toggles. Such tools empower developers to fine-tune feature availability, targeting specific user segments or environments while minimizing disruptions. With feature management tools, teams can automate the process of feature rollout, reducing manual intervention and accelerating the pace of software delivery. Furthermore, feature flag management tools provide insights into feature performance, enabling teams to make data-driven decisions and iterate on features.

Feature flags rollout strategies vary depending on the project requirements and development workflows, but feature management tools provide the necessary infrastructure to support these strategies. Whether implementing canary releases, gradual rollouts, or dark launches, feature management tools offer the flexibility to adapt rollout approaches to specific use cases. Moreover, these tools facilitate collaboration among cross-functional teams, allowing product managers, developers, and QA engineers to coordinate feature releases effectively and respond promptly to user feedback.

DORA Metrics: How Feature Flags Help You Measure Up

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