> In this case the code went from bad -> good. That doesn't matter, the code changed. It's not like you can know what effects changes had before checking wheth

> In this case the code went from bad -> good. That doesn't matter, the code changed. It's not like you can know what effects changes had before checking whether changes occurred. > The bug had existed for a long time before it finally got triggered in a catastrophic way. The issue isn't missing that one bug, it's not realizing that the code you are looking at isn't the version of the code on the affected machine. > Even a large codebase has parts that are relatively stable. `fbagent` in this situation was a service responsible for gathering metrics, which is something that doesn't need that many changes (relative to, say product code) to it once it works. Clearly changes were nevertheless happening. I don't care if you're dealing with a COBOL program that hasn't been updated since the 80s - if you have a problem now, I just don't see any reason why you would ever not check the revision history.