There are no client-side changes for this, we're just registering the microversion support. Someone would have to use this microversion when trying to attach a multiattach capable volume to a server. Related nova API change: I02120ef8767c3f9c9497bff67101e57e204ed6f4 Part of blueprint multi-attach-volume Change-Id: Iff590954e7e12ee630140024f70c98d3cfa14a31