The value of the object tmnxDhcpSvrSubnetDepletedEvent specifies
whether a notification is generated when this subnet is depleted.
When the value of this object is set to 'true(1)',
notification tmnxDhcpSvrSubnetDepleted is generated.
The value of this object is only meaningful when the value of
tmnxDhcpSvrSubnetAddrType is set to 'ipv4(1)'.