We had a similar situation.  Support told us to "Make a wish" and/or hit the API...so we did those things.   Here's a link to the github page of what we use.  We use it to check for Wan interfaces (wan1 & wan2) that are in a "failed" or "not connected" state.  We have the script setup to run once per day.  If one of the interfaces is in one of those states for that length of time, it gets added to a list and emailed to us.  It may not be super pretty, but it was our only option.   Here's the API page: https://dashboard.meraki.com/api_docs#return-the-uplink-information-for-a-device  We basically used the info pulled out of "Devices > Return the uplink information for a device." on that API page.  You'll be able to pull out the uplink status with that request.  The 4g Interface may be different, though.   Hopefully that gives you some ideas. ... View more

If you're looking to monitor the layer 1 status (physical up/down), you can use solarwinds via SNMP (this page may provide more info: https://thwack.solarwinds.com/thread/69928.  Some other monitoring system would be similar.   Otherwise, if you're needing more info about the actual status, you'll probably need to take advantage of the API.   We had to write a script (github link) to hit the API to see if the uplinks were "failed" or "not connected."  That script then sends a list of locations that have uplinks that are down/failed. ... View more