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[Armando Migliaccio <1457986@xxxxxxxxxxxxxxxxxx>]

Only the spec merged

** Changed in: neutron
       Status: Fix Released => In Progress

** Changed in: neutron
    Milestone: mitaka-2 => mitaka-3

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https://bugs.launchpad.net/bugs/1457986

Title:
  RFE: Need API to provide network IP allocation counts

Status in neutron:
  In Progress

Bug description:
  Operators have requested an API that allows them to quickly and easily
  determine the IP capacity of a network or subnet. Rather than
  discovering a network is full, an api could be proactively called by
  an operator or monitor to give some measure of when a network is
  reaching its capacity.

  Some things desired from a new API for both network and subnets
  * used IPs - How many IPs are reserved from a network/subnet
  * total IPs - The capacity of IPs for this network/subnet
  * Enough information about the network/subnet to be able to fetch detailed information about the resource (possible examples: id, name)

  Naturally used_ips/total_ips gives the user a way to determine the
  percentage the resource has been consumed.

  Some references to those needing this API:
  * Philidelphia operators at the OPs meetup expressed great interest after watching a presentation describing this use.
  * GoDaddy in-house implementation: In use for 1+ years. Also called by in-house NetworkAwareFilterScheduler. GoDaddy implementation:https://github.com/godaddy/openstack-neutron/commit/fcf325f9f9f7a9f87ba6bc1c53f9212d0e2decee
  * Rackspace implementation: https://github.com/rackerlabs/quark/blob/master/quark/ip_availability.py#L48

  Some notes about related patches (added 2015-11-17):
  * https://review.openstack.org/180803 (Neutron Spec)
  * https://review.openstack.org/#/c/212955 (Neutron patch)
  * https://review.openstack.org/#/c/234541 (Second Neutron patch)

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