@Beta
public interface AvailabilityZoneExtension

For a location that has sub-zones within it (e.g. an AWS region has availability zones that can be mapped as sub-locations), this extension interface allows those to be accessed and used. For some well-known clouds, the availability zones are automatically set, although for others they may have to be configured explicitly. The "multi:(locs,...)" location descriptor (cf MultiLocation) allows this to be down at runtime.

Note that only entities which are explicitly aware of the AvailabilityZoneExtension will use availability zone information. For example DynamicCluster

Implementers are strongly encouraged to extend AbstractAvailabilityZoneExtension which has useful behaviour, rather than attempt to implement this interface directly.