@mattdm ha, I didn't know Fedora did this! It's not an uncommon pattern, but I think it could be tweaked to be just as useful to maintainers while being more welcoming to issue reporters.
A simple solution could be to label *untriaged* issues as stale (or better: “Needs Attention”) after some time of inactivity with a gentler comment about, “Sorry we haven't been able to triage this. If you know it’s still an issue in the latest release, feel free to comment to help us triage it.”