Event ID 2013 (Disk Is At Or Near Capacity) not getting logged

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http://serverfault.com – I'm trying to set up alerts for low disk space conditions on a server (Windows Server 2008 R2 Enterprise, SP1). To do this I want to trigger an email via Task Scheduler whenever Event ID 2013 is logged in the System event log. The problem is that Event ID 2013 doesn't seem to be occurring. The LowDiskSpaceMinimum and DiskSpaceThreshold registry keys are not present, which to my understanding should mean that Event 2013 occurs when the disk space of any partition drops below 10 percent. I've tried to trigger this event on three servers now, on system drives (C:) or data drives (E:). I have (HowTos)