private void updateVipStatusOnCoverageChange(Group group, boolean sufficientCoverage) {
        if ( localCorpusDispatchTarget == null) { // consider entire cluster
            // VIP status does not depend on coverage
        }
        else if (usesLocalCorpusIn(group)) { // follow the status of this group
            setInRotationOnlyIf(sufficientCoverage);
        }
    }
Called by the cluster monitor when node state changes to failed
container-search/src/main/java/com/yahoo/search/dispatch/searchcluster/SearchCluster.java