Node.js gaming experiment rollbacks require separate heartbeat health checks

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For gaming experiments using Node.js cron jobs, successful retries should not be considered proof of system health. Developers must record separate durable completion heartbeats for each tenant cohort and schedule window, then have an independent watchdog monitor these records against explicit deadlines. Only cohorts with late or incomplete evidence should be rolled back, as a global success signal can hide partial failures where some cohorts were updated while others were skipped. The watchdog should compute deadlines based on observed queue delays and execution times, not arbitrary time limits.

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