private Metric.Context getContext(Map<String, String> dimensions) {
        return contextMap.computeIfAbsent(dimensions, metric::createContext);
    }
A version 6.163.20 will be returned as a number 163.020. The major
version can normally be inferred. As long as the micro version stays
below 1000 these numbers sort like Version.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/maintenance/MetricsReporter.java