In my environment a "bug" is not always like that. I can be something that has been there for awhile so you cannot roll back. Also the bug may be due to something missing that should be there. The bug may be related to an essential feature that you cannot just roll back entirely. You can't roll that back. Plus you also have environmental issues like a new version of a browser ships and you have to deal with something that a rollback cannot fix.
HOWEVER, if you discover a bug close to when that code was released, then rollback and breathe a sigh of relief, and fix it un-rushed.
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In my environment a "bug" is not always like that. I can be something that has been there for awhile so you cannot roll back. Also the bug may be due to something missing that should be there. The bug may be related to an essential feature that you cannot just roll back entirely. You can't roll that back. Plus you also have environmental issues like a new version of a browser ships and you have to deal with something that a rollback cannot fix.
HOWEVER, if you discover a bug close to when that code was released, then rollback and breathe a sigh of relief, and fix it un-rushed.