public String suspend(ApplicationId id, ZoneId zone, boolean suspend) {
        return toMessage(send(request(HttpRequest.newBuilder(suspendPath(id, zone))
                                                 .timeout(Duration.ofSeconds(10)),
                                      suspend ? POST : DELETE)));
    }
Sets suspension status of the given application in the given zone.
hosted-api/src/main/java/ai/vespa/hosted/api/ControllerHttpClient.java