A txg records its bytes only when it syncs and the mover reports every 2 s, so a per-sample delta
read 0 most of the time. Rates are now taken over the gap between syncs (or mover updates) and held
until the next one.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Live from arcstats (dirty), dmu_tx (throttled writes), each pool's txgs (bytes synced to disk)
and objset kstats (bytes from programs). A landing tier — a mergerfs pool whose first branch is
fast storage and whose last is a ZFS dataset — is detected from mergerfs's branch xattr; a mover
status file in /run/landing-mover/ adds its queue, the file in flight and totals. Sensors
zfs.write.*, zfs.<pool>.write_bps|logical_bps and zfs.<pool>.landing.* carry the history.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
