public Builder setZooKeeperServerAddress(String zooKeeperServerAddress) {
            if (zooKeeperServerAddress == null || "".equals(zooKeeperServerAddress)) {
                throw new IllegalArgumentException("zookeeper server address must be set, was '" + zooKeeperServerAddress + "'");
            }
            this.zooKeeperServerAddress = zooKeeperServerAddress;
            return this;
        }
Maximum time a node can be missing from slobrok before it is tagged down.
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/FleetControllerOptions.java