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

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Use a server-side flag to stop new notification delivery attempts, but do not call the incident contained until the queue has stopped producing failures. Short answer: a useful kill switch changes one narrow runtime decision, emits an audit event, and leaves failed jobs available for deliberate replay. For a marketplace notification service, that means disabling delivery while preserving the order, seller, channel, and attempt context needed to recover later. The decision rule is blunt: flip the switch when failed deliveries represent a real user-impacting condition, not merely when one provid

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