By LUN, I assume you're meaning storage 'devices' that are instantiations under a host (as opposed to EMC/Netapp LUN RKs). You're trying to do a Top-N on instantiated metrics. That capabilities does not exist in vC Ops 5.8.1. You could do a supermetric to show you the max value of the highest lun latency, but you wouldn't be able to see what the LUN name is.
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