A bucketed metric over a window, optionally broken down by a property

Buckets created_at by hour, day, week (Monday-start) or month of the local calendar of timezone (an IANA name, default UTC; a day can last 23 or 25 hours); each point's t is its bucket start as a UTC instant. Points are filled for every bucket in the range (max 1000). Interval total skips the buckets: each series has its whole-window total and an empty points list, which suits rankings (breakdown_limit up to 1000). Metrics: total, unique_users (exact), per_user, and sum, avg, min or max of the event property named by property. A numeric metric reads a value only when the whole string parses as a finite number; anything else (missing, empty, text, nan, inf) is left out and counted in non_numeric_values. Values are IEEE doubles. A bucket with no numeric value has sum 0 and avg, min and max null (unknown, never 0). Without a breakdown there is one series keyed "$all"; with one, the top breakdown_limit values ranked by the metric (keys without a value last, ties by key), an absent property reported as key "", and the rest as one Other series ("$other", other: true).

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