hello Adam,
I want to check the rule is well applied just using a simple Meraki display (not using any sniffer-like, or another tool like IPERF). Just using Meraki display.
Maybe there is a way to see how many time a traffic rule is matched.
On a security appliance, there is some hits counters for the firewall L3 rules.
On some Cisco product (not Meraki one's) there is a display to show if the QoS is match/applied
example: show policy-map interface
Regards,