Actually, Meraki support came back to me with a reason. This is due to IPV6 multicast traffic that get dropped by the switch ports from different VLANSs which is incrementing the interface outdiscard number , that is being reported over the SNMP. We don't use IPv6 so IMHO the answer is we put in a GPO to disable IPv6 on PC NICs but boss doesn't think it's a good idea. So I just turned off monitoring for OutDiscardPercent on Meraki devices.
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