public void saveStartTimestamps(DatabaseContext databaseContext) {
        fleetControllerContext.log(logger, Level.FINE, () -> "Scheduling start timestamps to be stored into zookeeper.");
        pendingStore.startTimestamps = databaseContext.getCluster().getStartTimestamps();
        doNextZooKeeperTask(databaseContext);
    }
This is called to attempt the next task against ZooKeeper we want to try.

@return true if we did or attempted any work.
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/database/DatabaseHandler.java