The low threshold for available free addresses in this
pool. If the value for available free addresses in this
pool becomes equal to or less than this value, a
dhcpv4ServerFreeAddressLow event is generated for this
pool. No more dhcpv4ServerFreeAddressLow events will be
generated for this subnet during this execution of the
DHCP server until the value for available free addresses
has exceeded the value of
hpicfDhcpv4ServerPoolHighThreshold.