I believe solution is good separation of concerns. Things like error handling, logging, feedback and such should be handled globally with only one piece of code. Only requirements, that are different from this global behavior should be noted as either part of user stories, or in discussion about implementation of said user story.

I believe solution is good separation of concerns. Things like error handling, logging, feedback and such should be handled globally with only one piece of code. Only requirements, that are different from this global behavior should be noted as either part of user stories, or in discussion about implementation of said user story.

So from project management side, there should be one User Story, that says "As a user I want to see error in a such a way, that allows me to report it to the administrator." or something like that. And this user story should apply as a global rule to all use cases.