Query Tags stopped returning results

Good day all. The other day I had an issue with a query tag that wasnt running but had a "good" status of the returned value in it. After troubleshooting with Ignition tech support, we found this:

So, after restarting my server that houses the Ignition instance, the queries starting returning actual results again.

Is there some sort of handshake or whatever to help me keep and eye on this?

Go to your Gateway->Status-> Store and forward, look for any quarantine there

Thanks, thats helpful.

Anyway I could make some kinda tag to key off of?

The system tags per DB connection in the Store And Forward section?
https://docs.inductiveautomation.com/display/DOC81/System+Tags#SystemTags-GatewaySystemTags