@CheckForNull
    @Override
    public CNode describe(HudsonPrivateSecurityRealm instance, ConfigurationContext context) throws Exception {
        // allow disabling exporting users if an instance has too many
        if (System.getProperty(
                        "io.jenkins.plugins.casc.core.HudsonPrivateSecurityRealmConfigurator.exportUsers", "true")
                .equals("true")) {
            return super.describe(instance, context);
        }
        return null;
    }
@author <a href="mailto:nicolas.deloof@gmail.com">Nicolas De Loof</a>
plugin/src/main/java/io/jenkins/plugins/casc/core/HudsonPrivateSecurityRealmConfigurator.java