nova/releasenotes/notes/placement-required-traits-o...

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---
features:
- |
Placement API microversion 1.18 adds support for the `required` query
parameter to the `GET /resource_providers` API. It accepts a
comma-separated list of string trait names. When specified, the API
results will be filtered to include only resource providers marked with
all the specified traits. This is in addition to (logical AND) any
filtering based on other query parameters.
Trait names which are empty, do not exist, or are otherwise invalid will
result in a 400 error.