Hard to take back an already open can of tuna from the cats; you know, cat (and developers) can be very protective of what they have already gotten.
Out of curiosity, are the external tables filtering particular ORA- events?
Answering your direct question, I do not think Oracle has a particular best practice recommendation about not allowing developers to see it. I know, I know... a bunch of non-DBA looking at the alertlog can be an annoyance, I feel for you.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
if it's just to see job errors you can try migrate jobs using dbms_scheduler, scheduler jobs I believe store their errors in *_SCHEDULER_JOB_RUN_DETAILS
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