This may be a duplicate bug, if so please let me know. While worker-output keeps track of these changes, it would be helpful for libraries to see more details why their batch modification process or import process failed. As it stands in Koha, you can only see that the import / batch mod process failed as well as when it succeeded. What libraries are looking for are logs like the patron import, where it lists why the patron data didn't import and what the problem is.
This is something that would be very useful for our cooperative. Batch modifications of less than 30 items are easy enough to comb through for any exceptions, but if you're modifying hundreds or thousands of items, the exceptions become much more laborious to find. And without knowing why those particular items failed, that's more staff time spent on follow up that could be better used elsewhere.