public Duration zeroTraffic(int measurements, int prodRegions) {
        try (var lock = fixture.tester().nodeRepository().applications().lock(fixture.applicationId())) {
            var statusWithZeroLoad = fixture.application().status()
                                            .withCurrentReadShare(0)
                                            // the line below from TrafficShareUpdater
                                            .withMaxReadShare(prodRegions < 2 ? 1.0 : 1.0 / ( prodRegions - 1.0));
            fixture.tester().nodeRepository().applications().put(fixture.application().with(statusWithZeroLoad), lock);
        }
        return addQueryRateMeasurements(measurements, (n) -> 0.0);
    }
Assign measured zero traffic in the same way as the system will.
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/autoscale/Loader.java