@Test
    void transition_from_controlled_stop_to_down_does_not_add_to_crash_counter() {
        final ClusterFixture fixture = ClusterFixture.forFlatCluster(2)
                .bringEntireClusterUp()
                .reportStorageNodeState(1, State.STOPPING, "controlled shutdown") // urgh, string matching logic
                .reportStorageNodeState(1, State.DOWN);
        final NodeInfo nodeInfo = fixture.cluster.getNodeInfo(new Node(NodeType.STORAGE, 1));
        assertThat(nodeInfo.getPrematureCrashCount(), equalTo(0));
    }
Maintenance mode overrides all reported states, even Down.
clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterStateGeneratorTest.java