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Feature flag.

also: feature flags · feature toggle · feature toggles · kill switch · kill switches

A runtime switch that turns code paths on or off without a deploy, separating deployment from release.

the two-minute refresher

Deploy with the feature OFF; turn it on when ready, for some users first.
Uses: gradual rollout, A/B tests, kill switches, per-tenant features.
A bad feature is turned off in seconds, no rollback needed.
Remove old flags: stale flags are tech debt and hidden branches.

Where the course teaches it

W10 · Day 3Deployment Strategieslearn it →W10 · Day 3Deployment Strategiesrevisit →

Related concepts

Canary deployment
Rolling deployment