XAPI RRD Detailed Memory stats

I'd like to see more detailed RRD memory statistics offered in XAPI so that XenCenter and other tools like Xen Orchestra can show detailed memory stats that breakout cache/buffer/used as well as swap usage.

From what I can see the RRD already has this info:

https://github.com/xapi-project/xcp-rrdd/blob/95d891359b6ac0dc5e501ce5e6f66fb8b01cba57/rrdd/rrdd_stats.ml

see:
(** Represents a subset of the data in /proc/meminfo *)
type meminfo = {
total: int; (* KiB *)
free: int; (* KiB *)
buffered: int; (* KiB *)
cached: int; (* KiB *)
swap_total: int; (* KiB *)
swap_free: int; (* KiB *)
}