add-feature-flag

To add a feature flag in Rust, declare it as a non-default feature in Cargo.toml, update the FeatureFlag enum, and apply conditional compilation or runtime checks to selectively gate code behavior.

Feature flags enable safer, staged releases by allowing you to toggle features on or off without deploying new code, minimizing risk during production releases and dogfood builds.

Conditional compilation uses Cargo features declared in Cargo.toml to include or exclude code paths via cfg attributes, allowing dogfood builds to activate experimental features selectively at runtime.

Yes, you must declare the feature flag under the [features] section in Cargo.toml as non-default, then update your FeatureFlag enum and runtime gating logic to control activation safely.

Yes, feature flags support multi-channel releases by enabling selective activation of features across different build channels, ensuring safe gating without requiring immediate code changes.

Cargo features require manual updates to both Cargo.toml and the FeatureFlag enum, and managing many flags can complicate conditional compilation and runtime checks if not gated carefully.