@Override
        public void completed(String job, double successFactorDeviation, long durationMs) {
            var context = metric.createContext(Map.of("maintainer", job));
            metric.set("maintenance.successFactorDeviation", successFactorDeviation, context);
            metric.set("maintenance.duration", durationMs, context);
        }
Creates a maintainer where maintainers on different nodes in this cluster run with even delay.
configserver/src/main/java/com/yahoo/vespa/config/server/maintenance/ConfigServerMaintainer.java