@Override
    public int getMaxStages(@Nonnull final SessionData data) {
        return 1;
    }
Notifies the that a group was modified. It can be used by user providers to notify Openfire of the
modification of a group.

@author Gabriel Guarincerri
xmppserver/src/main/java/org/jivesoftware/openfire/commands/event/GroupModified.java