private boolean newNode(Node node) {
        return node.history().age(nodeRepository.clock().instant()).compareTo(Duration.ofMinutes(3)) <= 0;
    }
Returns true if this a new node (oldest node history event is less than 3 minutes old)
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/MetricsV2MetricsFetcher.java