zfs_arc plugin: Reading kstat value "other_size" failed.

[connection-reset]

• Version of collectd: 5.8.0
• Operating system / distribution: Arch Linux

Expected behavior

ZFS on Linux 0.7 no longer has other_size in /proc/spl/kstat/zfs/arcstats, it got replaced with dbuf_size, dnode_size and bonus_size.
openzfs/zfs@25458cb

zfs_arc plugin should read those when other_size is missing.

Actual behavior

parse_value: Failed to parse string as derive: "data".
zfs_arc plugin: `llist_search` failed for key: 'other_size'.
zfs_arc plugin: Reading kstat value "other_size" failed.

Steps to reproduce

• Install ZFS on Linux >= 0.7
• LoadPlugin zfs_arc

[Farfaday]

The issue disappeared after I upgraded to 5.8.1

[jplitza]

It didn't disappear for me, as in my backend (InfluxDB) is still reporting an error every time collectd inserts the values:

lvl=info msg="Dropping point" log_id=XXX service=collectd name=zfs_arc error="NaN is an unsupported value for field value

Update: Actually, this was caused by another problem that I fixed in #3246