I'm not actually sure that this gives you the light levels, but the most detailed command that I've been able to find for individual interfaces is 'show system state filter-pretty sys.sx.py.stats' where X is the slot number and Y is the port number.
Thanks for the reply. I have asked for someone to test the command you provided, but not sure how long it will take them. Will post when I know.
I was told by PA support that they do not have the feature and no plans to get it. So that means a physical dispatch is required to simply check light levels. Not good.
I would check with your SE if there is an active feature request to add this feature into PAN-OS. If there is post it here so that others can add their votes to it ;-)
We are also having the same situation, however I have raised a ticket with PA support desk. Will update you if I get some positive feedback.
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