To display on a chart (such as a broken line graph) results that include historical data from a point in the past to the current time, you specify definitions in such a manner that the results of rstream that cover a period of n seconds from the current time are displayed.
In this example, you specify n as the record retention period (RecordTime attribute in the RecordHoldTime tag) in the dashboard output connector definition in the output adaptor definition, and you define the field for storing the results of getTupleTime in such a manner that it holds the results obtained from n seconds in the past through the current time.
For another example of an output adaptor definition and details of the definition, see 11.4.1 Output adaptor definition (displaying the most recent data).