The high threshold for available free addresses in this
pool. If a dhcpv4ServerFreeAddressLow event was generated
for this pool, and the value for available free addresses
has exceeded the value of
hpicfDhcpv4ServerPoolHighThreshold, then a
hpicfDhcpv4ServerFreeAddressHigh event will be generated.
No more hpicfDhcpv4ServerFreeAddressHigh events will be
generated for this pool during this execution of the DHCP
server until the value for available free addresses
becomes equal to or less than the value of
hpicfDhcpv4ServerPoolLowThreshold.