Using the API is about the only way today other than per sensor in the UI as you mentioned. https://developer.cisco.com/meraki/api-v1/get-network-sensor-alerts-current-overview-by-metric/ I've tinkered around on this in the past and used the google sheet add on to collect the sensor data then have it charted in sheets to make nicer historical graphs. https://developer.cisco.com/meraki/build/meraki-dashboard-reports-with-google-sheets/
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