neutron/releasenotes/notes/switching-to-haproxy-for-me...

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---
features:
- In order to reduce metadata proxy memory footprint, ``haproxy`` is now used
as a replacement for ``neutron-ns-metadata-proxy`` Python implementation.
upgrade:
- Since ``haproxy`` was not used before by ``neutron-l3-agent`` and
``neutron-dhcp-agent``, rootwrap filters for both agents have to be copied
over when upgrading.
- To upgrade to the ``haproxy`` based metadata proxy, ``neutron-l3-agent``
and ``neutron-dhcp-agent`` have to be restarted. On startup, old proxy
processes will be detected and replaced with ``haproxy``.