My personal rule is that any code which doesn't get exercised at least weekly is untrustworthy. I once inherited a codebase with a heavy, custom blue-green depl

My personal rule is that any code which doesn't get exercised at least weekly is untrustworthy. I once inherited a codebase with a heavy, custom blue-green deploy system (it made sense for the original authors). While we deployed about once a week, we set up CI to test the deployment every day. Cold code is dead code.