The final line graph show you the number of tracked parcels (in grey) as compared with those that were actually completed (in green).
This is a simplified version of the graph shown in the Carrier Scan Completeness report. However, the graphs in the Data Quality Dashboard are based on the manifest date as opposed to the guaranteed delivery date.
Based on the convergence of the lines, the graph is intended to provide an instant snapshot of how complete the tracking data is for the particular carrier. You can then go to the Carrier Scan Completeness report for a more detailed analysis.
The Data Quality Dashboard graph uses the following definitions:
The number of parcels that that are no longer in transit and have had a 'stop the clock' event.
The number of parcels for which at least one tracking scan has been received from the carrier.