Counting events in fixed, non-overlapping one-minute buckets (12:00–12:01, 12:01–12:02, …) uses a blank window. A "last 5 minutes, updated every minute" count uses a blank window.

Answer

Counting events in fixed, non-overlapping one-minute buckets (12:00–12:01, 12:01–12:02, …) uses a tumbling window. A "last 5 minutes, updated every minute" count uses a sliding window.

Also accepted: tumbling window, fixed, fixed window for tumbling; sliding window, hopping, hopping window for sliding.

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