"Duplicate Reads" metric not calculated, always outputs 0.

[kachulis]

The "Duplicate Reads" metric is added to the output, however it is never actually calculated. Since there is also a "Mapped Duplicate Reads" metric which is calculated, it would seem reasonable to remove the "Duplicate Reads" metric

[agraubert]

You're absolutely correct. This seems to be a leftover counter from earlier in development. Thanks for pointing this out