Log "Churn " Percentage

[George-D-S]

In some places we have the start/end dates and the delete/insert/update pattern.

Is it possible to have a log or instrumentation or something for the percentage of records which were deleted, and to a lesser extent updated, with each incoming file. I believe this to be a good signifier of where something is wrong with the feed logic.

I was wonder if this could be done via session.deleted , session.updated etc. ?