zone property
Defines the local service zone where Envoy is running.
Though optional, it should be set if discovery service routing is used and
the discovery service exposes :ref:zone data , either in this message or
via :option:--service-zone. The meaning of zone is context dependent,
e.g. Availability Zone (AZ) _ on AWS, Zone _ on GCP, etc.
Implementation
core.String? zone;