public ZoneId defaultZone(Environment environment) {
        Inspector rootObject = toInspector(send(request(HttpRequest.newBuilder(defaultRegionPath(environment))
                                                                   .timeout(Duration.ofSeconds(10)),
                                                        GET)));
        return ZoneId.from(environment.value(), rootObject.field("name").asString());
    }
Returns the default {@link ZoneId} for the given environment, if any.
hosted-api/src/main/java/ai/vespa/hosted/api/ControllerHttpClient.java