As noted by @churchyard in a devel thread, it would be interesting to see how many FTI bugs get set to ASSIGNED to avoid retirement but never actually get fixed.

Doing this directly isn't particularly easy, but we can look for bugs with "FailsToInstall" in the summary that were closed EOL to get a reasonable approximation.

While we're at it, we can add the same search for FTBFS.

Tracking these trends over time can be a proxy for the health of package maintenance.