The os-pci API was never part of the v2.0 API and was added
to the v3 API, but when the v3 API turned into the v2.1 API
which is backward compatible with the v2.0 API, the os-pci
API was removed from v2.1. The original intent was to enable
it in a microversion but that never happened.
We should just delete this API since it has a number of issues
anyway:
1. It's not documented (which makes sense since it's not enabled).
2. The PciHypervisorController just takes the compute_nodes.pci_stats
dict and dumps it to json out of the REST API with no control over
the keys in the response. That means if we ever change the fields
in the PciDevicePool object, we implicitly introduce a backward
incompatible change in the REST API.
3. We don't want to be reporting host stats out of the API [1].
4. To make the os-hypervisors extension work in a multi-cell environment
we'd have to add uuids to the PciDevices model and change the API to
return and take in uuids to identify the devices for GET requests.
5. And last but not least, no one has asked for this in over two years.
As a result of removing this API we can also remove the join on the
pci_devices table when showing details about an instance or listing
instances, which were added years ago because of the PciServerController:
Id3c8a0b187e399ce2acecd4aaa37ac95e731d46c
Id3e60c3c56c2eb4209e8aca8a2c26881ca86b435
[1] https://docs.openstack.org/developer/nova/policies.html?#metrics-gathering
Closes-Bug: #1426241
Closes-Bug: #1673869
Change-Id: I9099744264eeec175672d10d04da69648dec1a9d
75a7e6fc7d