---
features:
  - |
    The ``nova_libvirt`` container's ``libvirtd.conf`` now raises libvirt's
    connection processing limits above their stock defaults, which are tuned
    for a multi-tenant host rather than for Kolla's single-privileged-client
    pattern. ``max_client_requests`` is raised from 5 to 20 and ``max_workers``
    from 20 to 50. Both are exposed as the ``libvirt_max_client_requests`` and
    ``libvirt_max_workers`` variables so they can be tuned further.
fixes:
  - |
    Fixed intermittent instance build failures (``Cannot recv data:
    Input/output error`` during ``defineXML``, leading to instances in
    ``ERROR`` state) that occurred when several instances were built
    concurrently. nova-compute is effectively the sole client of ``libvirtd``,
    and libvirt's default per-client request cap of 5 was being exceeded by
    concurrent builds plus periodic tasks, starving keepalive responses until
    ``libvirtd`` dropped the connection.