For those who are interested in better monitoring, netdata [1] [2] has
just merged support for low-level usage monitoring of BTRFS volumes. It
provides graphs for both physical on-disk usage by chunk type (both
allocated and used) and per-chunk type graphs of usage as reported by
`btrfs filesystem df`. It also comes with a predefined alarm that fires
when things are getting close to full.
While it's not in a release yet (it should be in the next release, but
that may be a while since 1.9 just got released), the devs do a great
job of keeping things stable enough that you can run the master branch
off of Github in production.
For those who care about the low-level stuff, this is pulling allocation
data out of /sys/fs/btrfs/<UUID>/allocation/.
[1] https://my-netdata.io/
[2] https://github.com/firehol/netdata
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