private static Status getStatus(Inspector statusObject) {
            return new Status(Instant.ofEpochMilli(statusObject.field(EPOCH_MILLIS).asLong()),
                              statusObject.field(SPEED).valid() ? statusObject.field(SPEED).asDouble() : 0.2,
                              statusObject.field(CAUSE).asString());
        }
Sets up a listenable cache with the given listener, over the applications path of this tenant.
configserver/src/main/java/com/yahoo/vespa/config/server/application/ApplicationCuratorDatabase.java