Tag legacy-code does not have wiki nor excerpt. Tag legacy wiki excerpt is
Questions about legacy languages, code, or applications.
I am not sure that I agree.
Legacy can have a different meaning when being used to describe the old application during an application rewrite project.
What columns are we supposed to display on the Inventory Summary panel again? What does the legacy application have?
Legacy code I feel is just describing or talking about old code in an application. Granted the example questions you have posted are tagged legacy but actually about legacy code.
What I suggest instead is to create legacy-application instead.