When deleting an AWS RDS instance, it is common for it to take a long time. I have had consistent failures of my aws-nuke command leaving parts of the database behind. Re-running aws-nuke after a while deletes the remaining resources just fine.
To resolve this I would like to be able to configure more retries when a resource is in the "failed" state. I believe this will work because I see the number of "failed" deletions decreasing over time as the run waits on other resources that are still in progress.