This was the final support response I got on this (and I was not interested in re-onboarding all my devices with the new auth key). I'll happily just live with these messages once a day: "1. As found that "Auto mongo backup: Failed to backup database 'pan_ms' collection 'msak'" message is a benign message that occurs when there are no entries configured under: Panorama -> Device Registration Auth Key. 2. And also found this particular log message is a benign message. If the script does not find msak collection in pan_ms database of mdb instance it leaves this message, since there is nothing to backup. 3. It looks like none of the firewalls managed by this panorama has an authkey configured resulting in this message."
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