Recently I've been thinking about the tickets on rt.cpan.org associated with modules which no longer exist. For context see CPAN Day - 16th of August. One argument for not deleting these along with the module would be that a user may not know that a module they use has been deleted from CPAN, any bugs, patches and discussions in the associated rt queue would be useful to them. Perhaps there are other reasons I've not yet thought of for keeping them around.
I wonder if it's worthwhile flagging each ticket associated with a deleted module, so that people could easily filter them out when browsing the queue and/or a way to highlight this, be it via displaying an additional field or some CSS.
I'd be keen to find out if anyone had any additional thoughts on this issue.