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duplicate of Software - Bug / Issue
First Law of Software Quality:
<MATH> \begin{array}{lrl} \text{errors} & =& (\text{more code})^2 \\ e & = & mc^2 \end{array} </MATH>
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Accept that crap happens, live, learn, and move on.
When development is as close to production as we can, the bug would present there long before prod.
There are no bugs, only happy little accidents
You need the willingness to fail all the time.
Every Sysadmin most do
See also: Postmortem