Have you verified following areas for your below Qns:
Qn1: Suggest using unit test feature available within strategy canvas to test the logic
Qn2: Data Flow run metrics should give you detailed information about the DF run and in case of failure under failure column, componentwise failure count will listed. Clicking on the hyperlink will take you to the detailed failure information page.
Yes I want to enable logging in production. Currently I am unable to log in development itself. In my system I am able to enable logger for Activities etc. But when I am adding the strategy class in Logger I am unable to see anything in log files.
Is there anything specific we need to do to enable strategy logging.