cinder/releasenotes/notes/bug-1667071-dc6407f40a1f7d1...

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---
fixes:
- Modifying the extra-specs of an in use Volume Type was something that
we've unintentionally allowed. The result is unexpected or unknown
volume behaviors in cases where a type was modified while a volume was
assigned that type. This has been particularly annoying for folks that
have assigned the volume-type to a different/new backend device.
In case there are customers using this "bug" we add a config option to
retain the bad behavior "allow_inuse_volume_type_modification", with a
default setting of False (Don't allow). Note this config option is being
introduced as deprecated and will be removed in a future release. It's
being provided as a bridge to not break upgrades without notice.