Node.js Feature Flag Safety: Kill Switch Control for Marketplace Incidents

Node.js feature flags provide critical kill switch control for marketplace incidents by disabling notification delivery while preserving context for later replay. Effective switches trigger based on failure ratios and sample counts rather than single requests. In property-management contexts, balancing freshness and reconstructability requires recording configuration generations and tenant cohorts. Systems should maintain verified snapshots, define conservative defaults, and treat remote flag services as control planes rather than synchronous dependencies to ensure stability during tenant-notification requests.