@Override
  public String getAlertLevelAsString() {
    return super.getAlertLevelAsString();
  }
This method is used to process ClientMembership events sent for BridgeMembership by bridge
servers to all admin members.

@param senderId id of the member that sent the ClientMembership changes for processing (could
       be null)
@param clientId id of a client for which the notification was sent
@param clientHost host on which the client is/was running
@param eventType denotes whether the client Joined/Left/Crashed should be one of
       ClientMembershipMessage#JOINED, ClientMembershipMessage#LEFT,
       ClientMembershipMessage#CRASHED
geode-core/src/main/java/org/apache/geode/admin/jmx/internal/AdminDistributedSystemJmxImpl.java