public void setAlertLevel(String levelName) {
    int alertCode = LogLevel.getLogWriterLevel(levelName);
    AlertLevelChangeMessage m = AlertLevelChangeMessage.create(alertCode);
    sendAsync(m);
  }
Sets the alert level for this manager agent. Sends a {@link AlertLevelChangeMessage} to each
member of the distributed system.
geode-core/src/main/java/org/apache/geode/management/internal/MemberMessenger.java