I do not believe there is a native way in Meraki dashboard to get this information. The closest to this I have seen is the Organization Summary report but it does not give the level of detail you want. It only shows the uptime percentage for an uplink port along with jitter and latency. The only way I have done this before is by using a 3rd party tool like PRTG to collect data via snmp. I would also be interested in knowing how others are doing this.