private static AlertLevel getAlertLevel(Notification notification) {
    return AlertLevel.valueOf(getUserData(notification).get(ALERT_LEVEL).toUpperCase());
  }
Fails due to GEODE-5923: JMX manager only receives local Alerts at the default AlertLevel

<p>
The JMX manager's local AlertListener for itself remains stuck at {@code SEVERE} even after
invoking {@link DistributedSystemMXBean#changeAlertLevel(String)}.
geode-core/src/distributedTest/java/org/apache/geode/management/DistributedSystemMXBeanWithAlertsDistributedTest.java