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Allow option to prevent trend interpolation after the most recent data value

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Originally posted on UserVoice

Currently, trends interpolate a line after the most recent data value--which means that if the last value occurred two hours ago a flat line will be drawn on the trend from the last value until now, which can erroneously give the impression that data has been received during that time period.  If interpolation could be disabled, this would have the trend not draw a flat line after the most recent value, but rather simply terminate the trend line at the last data point.  This is related to the following related item: https://feedback.osisoft.com/forums/555148-pi-server/suggestions/18496177-add-new-pipointattribute-for-staletimeout; however, adding this option to the trend would solve the underlying problem in a much more elegant way.

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