Hope you have GLB ( Global Load Balance in place to make active-active LB here)
Vmotion does base on the failure scenario triggers or VM will be motioned in the same subnet other DC - since DCI stretched over Laye2, for F5 it is transparent. ( again this depends on the design of how VLAN and IP subnet stretched.)
If the LB independent per DC, then you have equal Service/servers available both the side, that time you do not need to move the VM, you get trigger alerts from LB that service/server down, you need to investigate and fix. ( mean time rest of the load will be shared across active and live servers/services).