private void verifyDistributedMemberCanReceiveMessage(final DistributedMember member) {
    if (!(member instanceof InternalDistributedMember)) {
      throw new IllegalArgumentException(
          "Creation of AlertListenerMessage requires InternalDistributedMember instead of "
              + member.getClass().getSimpleName());
    }
  }
Remove verifyDistributedMemberCanReceiveMessage when AlertListenerMessage no longer casts to
InternalDistributedMember.
geode-core/src/main/java/org/apache/geode/alerting/internal/AlertListenerMessageFactory.java