public MockNameResolver explicitReverseRecords() {
        this.explicitReverseRecords = true;
        return this;
    }
When true, only records added with {@link MockNameResolver#addReverseRecord(String, String)} are considered by
{@link MockNameResolver#resolveHostname(String)}. Otherwise the latter returns the IP address by reversing the lookup
implicitly.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/MockNameResolver.java