Munin can ether render all graphs and html pages cron driven or with cgi (in fact you always need cgi if you want the zoomable graph view). There some issues with the needed apache configuration.

graph_strategy

html_strategy

Apache config

cron

cron

without zoomable graphs with zoomable graph

cgi

cron

cgi / cron

cgi

cgi

Apache 2.4 configuration snippets

cron / cron / no zoomable graph

Alias /munin /var/cache/munin/www
<Directory /var/cache/munin/www>
        Require local
        Options None
</Directory>

cron / cron / with zoomable graph

Alias /munin /var/cache/munin/www
<Directory /var/cache/munin/www>
        Require local
        Options None
</Directory>

ScriptAlias /munin-cgi/munin-cgi-graph /usr/lib/munin/cgi/munin-cgi-graph
<Location /munin-cgi/munin-cgi-graph>
        Require local
        <IfModule !mod_fcgid.c>
            SetHandler cgi-script
        </IfModule>
</Location>

cgi / cron / with zoomable graph

Alias /munin /var/cache/munin/www
<Directory /var/cache/munin/www>
        Require local
        Options None
</Directory>

ScriptAlias /munin-cgi/munin-cgi-graph /usr/lib/munin/cgi/munin-cgi-graph
<Location /munin-cgi/munin-cgi-graph>
        Require local
        <IfModule !mod_fcgid.c>
            SetHandler cgi-script
        </IfModule>
</Location>