Jonathan, Dave:
The GC UPS went onto battery power yesterday evening at 20:38 and sent email to sysadmin. The MSR UPS did not send email, it went onto battery power for less than one second. The attached mains_mon trend shows that this glitch was seen in the CS-EBAY, but it was a very slight dip in voltage on two of the phases. Perhaps the glitch was more significant in the GC server area.
The GC tolerances are set a little tighter. We get far more transition on it that the other UPSs.