dd0c/cost

# Know about cost spikes before the bill arrives

Welford's algorithm builds running baselines per resource type. Z-score anomaly detection catches spikes in real time. Slack alerts with one-click snooze for expected costs. Governance engine auto-promotes from shadow to enforce.

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### Statistical baselines

Welford's online algorithm. No batch jobs. Baselines update with every data point. Optimistic locking prevents corruption.

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### 0-100 anomaly score

Z-score mapped to a simple 0-100 scale. Set your threshold. Default 50 (2σ). Tune per resource type.

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### Governance engine

Shadow → audit → enforce. Auto-promotes after 14 days with <10% false positive rate. Safe by default.

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### Snooze & mark expected

Known cost spike? Snooze for 1-168 hours or mark as expected. Reduces false positive rate over time.

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