I install/setuped collectd just yesterday, go to the 3.6.1 even without noticing it 
but luci-statistics script - I dont get it. It looks like it just copy collectd.conf somewhere else, after parsing it? No, thanks.
I quickly found, that luci-statistics dont need to be run at all. I just configure /etc/collectd.conf to get what I need, and it still works through Luci web interface, fortunatelly (with exception of thermal module, sadly… propably because old version on turris repo).
So I install collectd and his luci module, but enabled autostart only for collectd, not luci-statistics script.