We introduced customization solution.
Now, we support two format of footer.
1. the legacy way: {{ include_footer }}
2. the new way: {% block footer %}{% endblock %}
there two conflict about this now[0][1].
I think the option 2 is better. We can get more consistent solution.
[0] https://review.openstack.org/#/c/357746
[1] https://review.openstack.org/#/c/361253
-- 
Regards,
Jeffrey Zhang
Blog: http://xcodest.me
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