Node.js Feature Flag Rollouts: Stable Bucketing for 10% Notification Releases

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Short answer: store the rollout percentage in the flag system, but make the release decision in the request path with a deterministic hash of an immutable user or account ID. For a property-management notification service, that means the same tenant stays on the same delivery path while a 10% release is evaluated; otherwise, users switch cohorts between requests and the delivery-failure signal becomes noise. The least complex useful design is one percentage, one documented hash rule, and one SLO guardrail. Do not call a random-number generator on every request. Do not start with an experiment

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