Errors are symptom of something. What you should do depends on the cause. If the errors are caused by say monitoring then that should be adjusted, elseif the site provides valuable information then you could redirect non-existing URI's to an existing one. Looking at it from another POV, logging exists to inform you of errors. Adapting an Austrich policy means you'll never get informed when you need it, say when you're troubleshooting. Looking at logs isn't fun nor efficient, so maybe instead use a reporting tool like Logwatch to tally errors and report them to you. You then should only see one line per return code and path. If none of that matters to you or if you don't care then you could simply make Apache filter logs using something like 'ErrorLog "| /path/to/filter >> /path/to/log"'.
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