Time Series: This tracks change in value of a consistent metric over time (e. g., monthly sales).
时间系列：这个跟踪随时间变化，同一度量的值变化趋势(例，月度销售)。
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References include thresholds, targets, previous values, etc. A trend is a specific kind of reference in which a series of metric values is compared to observe behavior. over time.