Query regarding disappearing sensor

Hi, I'm just seeking confirmation of what I suspect is a vendor bug.

On a fortigate 200F, a PSU failed and obs registered a status alert - but 4 hours later, it regsitered the sensor being deleted entirely.

This meant that when we looked at our alerts dashboard, we didn't see a problem - because the unit was only reporting that it had 1 PSU.

Is this an issue with the data coming back from the device? If so I will raise a TSR with them.

Thanks!