These stateful disks will never be deleted during autohealing, update or
VM instance recreate operations. This flag is used to configure if the
disk should be deleted after it is no longer used by the group, e.g. when
the given instance or the whole group is deleted. Note: disks attached in
READ_ONLY mode cannot be auto-deleted.
Possible string values are: [...]
read / write
The hash code for this object. [...]
A representation of the runtime type of the object.