[Observium] Initial doubts

Hi, I posted some questions in the forum, but the maillist seems to be a lot more active, so I'll summarize them here:

1- Trending Support: Is that on the roadmap?, from what I've read RRD already supports trending.. 2- Collectd: I see there's support for collectd, should I implement it alongside observium?, would that duplicate data?. Which version works nice with observium?, 4.10 or 5.0?

Regards,