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The purpose of this check is to test for trends in each of the input timeseries and send log messages whenever a trend is detected. Each timeseries is processed independently. One of the strengths of the Mann-Kendall check is that it also be used when there are lots of missing values. Unfortunately there is a limit on the number of non-missings that can be processed reasonably, since the calculation of the slopes requires memory for n * (n + 1) / 2 values. It is therefore recommended to aggregate the values first when there are many values in the timeseries to be checked.
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