static String applicationPath(ApplicationId application) {
        return "/vespa/host-status/" + application.serializedForm();
    }
Handles all ZooKeeper data structures related to each active application, including HostInfo.
Cache (if any) is above and not visible here.

@author hakonhall
orchestrator/src/main/java/com/yahoo/vespa/orchestrator/status/HostInfosServiceImpl.java