private List<LoadBalancerId> readLoadBalancerIds(Predicate<LoadBalancerId> predicate) {
        return db.getChildren(loadBalancersPath).stream()
                 .map(LoadBalancerId::fromSerializedForm)
                 .filter(predicate)
                 .toList();
    }
Returns the instant after which a firmware check is required, if any.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/persistence/CuratorDb.java