Do not emit recordsProcessed for records where no Spark reads where done

[jonas]

Motivation

Each stage automatically emits the recordsProcessed metric which may lead to zero values for stages that do not do any Spark reads. Avoid the zero values to not skew the dashboard which does a mean on the values returned for a given day.

Input

The sparkRecordsRead counter.

Output

No recordsProcessed custom metric is emitted for stages that does no reads.