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This is done to optimise our computational resources. We can use more complex algorithms for rapid changing metrics and lighter weight algorithms for stable metrics. Non-active metrics are not considered for analysis (time series with no data points in the last 7 days).
For this analysis the data of the last week are used. We find out the typical rate at which the data come in (frequency), and and how often they change (activity). Then each time series is classified according to frequency and activity into three main groups:
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