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---
features:
- |
Compute drivers now expose capabilities via traits in the
Placement API. Capabilities must map to standard traits defined
in `the os-traits project
<https://docs.openstack.org/os-traits/latest/>`_; for now these
are:
* ``COMPUTE_NET_ATTACH_INTERFACE``
* ``COMPUTE_DEVICE_TAGGING``
* ``COMPUTE_NET_ATTACH_INTERFACE_WITH_TAG``
* ``COMPUTE_VOLUME_ATTACH_WITH_TAG``
* ``COMPUTE_VOLUME_EXTEND``
* ``COMPUTE_VOLUME_MULTI_ATTACH``
* ``COMPUTE_TRUSTED_CERTS``
Any traits provided by the driver will be automatically added
during startup or a periodic update of a compute node. Similarly
any traits later retracted by the driver will be automatically
removed.
However any traits which are removed by the admin from the compute
node resource provider via the Placement API will not be
reinstated until the compute service's provider cache is reset.
This can be triggered via a ``SIGHUP``.
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