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Yes, that is a feature of the UPS, not the server. As stated by KFaganJr, an agent needs to be running on the server, which will receive notifications from the UPS to shut down the box.
Also, a central monitoring solution could get the battery alert from the UPS and remotely execute the necessary commands to shut down monitored machines. In this case an agent might not be needed on the servers, but the UPS still needs to inform about the battery status, most likely through SNMP.
Yes, that is a feature of the UPS, not the server. As stated by KFaganJr, an agent needs to be running on the server, which will receive notifications from the UPS to shut down the box.
Also, a central monitoring solution could get the battery alert from the UPS and remotely execute the necessary commands to shut down monitored machines. In this case an agent might not be needed on the servers, but the UPS still needs to inform about the battery status, most likely through SNMP.