private int physicalMemoryPercentage(ContainerCluster<?> cluster) {
        QrStartConfig.Builder b = new QrStartConfig.Builder();
        cluster.getConfig(b);
        return b.build().jvm().heapSizeAsPercentageOfPhysicalMemory();
    }
Recreate the combination used in some factory tests
config-model/src/test/java/com/yahoo/config/model/provision/ModelProvisioningTest.java