@Override
  public void unregisterAllSubscriptions(String sessionId) {
    SessionSubscriptionInfo info = this.subscriptionRegistry.removeSubscriptions(sessionId);
    if (info != null) {
      this.destinationCache.updateAfterRemovedSession(info);
    }
  }
Return the name for the selector header.
@since 4.2
ambari-server/src/main/java/org/apache/ambari/server/agent/stomp/AmbariSubscriptionRegistry.java