It seems like a device on the wifi is flooding the AP with broadcast traffic.
More info can be seen in the air marshal docs
https://documentation.meraki.com/MR/Monitoring_and_Reporting/Common_Wireless_Event_Log_Messages#Air_...
Typically flooding will cause problems when buffers are overloaded or specific devices (DHCP servers, gateways etc) are overwhelmed by requests.
It's difficult to say exactly whether this would cause a major impact in your environment but I would think most enterprise equipment should be able to deal with 1000 packets in a 10 second interval.
