Software Feature Flag Checklist

Feature flags can reduce release risk when they have a clear purpose, safe default, owner, rollout plan, and removal date. They create risk when flags accumulate, conflict, or become permanent hidden configuration nobody can explain.

Define the flag purpose

Record the change, decision, experiment, emergency control, or migration the flag supports. State what the system does when the flag is missing, unavailable, false, or incorrectly configured.

Set owner and lifecycle

Name business and technical owners, created date, rollout date, review date, expiration, cleanup issue, and removal evidence. Every flag should have a reason to exist and a plan to stop existing.

Define audience and targeting

Document environment, role, account, percentage, location, device, or other targeting. Avoid exposing sensitive attributes in flag rules and ensure the targeting does not create an unauthorized access path.

The configuration management checklist and rollback plan cover state and recovery.

Test every state

Test on, off, missing, stale, conflicting, partially rolled out, provider-failed, and reverted states. Include permissions, data migration, notifications, integrations, caches, jobs, and user sessions affected by the flag.

Monitor business impact

Track error, latency, completion, support, data quality, conversion, or another measure tied to the change. Record which audience saw the state so a report can be interpreted.

Control access and changes

Limit who can create, edit, target, or disable flags. Keep an audit record, approval path, secret boundary, and emergency process for high-impact flags.

Clean up deliberately

Remove code paths, tests, documentation, dashboards, targeting, and flag data when the decision is complete. Review stale flags on a cadence so a temporary control does not become invisible permanent complexity.