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How do you build anomaly detection for a streaming time series, and how do you handle seasonality and concept drift?

Threshold alerts fire all weekend and miss the real outage Monday. The signal is decomposing seasonality first, choosing the right detector, and tuning for alert fatigue. Here is the answer that survives production.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

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