btrfs-progs v5.7 breaks parsing of stats

[1n5aN1aC]

As title. Upon upgrading to Btrfs Progs v5.7, parsing the results is broken. this is shown in the logfile for telegraf:

Error in plugin: metric parse error: expected field at 32:67: "btrfs,command=usage,type=Multiple_profiles,pool=/mnt/docker value=no"

[1n5aN1aC]

Update: this is caused by an extra line in btrfs fi usage which reads Multiple profiles: no
I believe it's wanting a number, but we're giving it a string "no" and it doesn't like that.

If it looks trivial to do so, I may make a pull request with fixes.

[1n5aN1aC]

Pull Request #3 fixes this issue, at least in my environment.
I attempted to do it in a way that will not break on the old versions either.

[1n5aN1aC]

#4 solves this as well.

However note that BTRFS 5.10 was just released and adds another line to be parsed like 5.7 did, causing it to break it again.

Here's the quick and dirty fix, though really this should be solved in a different way. This is a bit hack-y:

if "statfs" in metric:
                    continue