The registry merges a physical disk's rows one step at a time, choosing
the temperature by source preference and merging collection states
separately. The pairing rule from #2618 was exact for two rows only: with
three or more, an earlier step's single merged state stood in for its
rows. A silent agent, an offline Unraid inventory and a stale Proxmox
copy could leave a withdrawn 41 labelled collected, and a legacy agent's
stateless reading could pick up another row's "unsupported".
The merged disk now keeps each row's current reading and state
(merge-time only, never serialized), and the shown value takes its state
from the readings of that value: a collected reading first, then the
agent's own report over a copy. A copy of an agent source's state gives
way to the agent's own withdrawal, including a legacy agent's sourceless
one, and a value source preference keeps after its row reported again
keeps its presented state under that row's later withdrawal. Value
selection is unchanged.
Normalization may keep a disk temperature it did not collect (a disk in
standby, a host agent past its reporting lease) as long as its collection
state says so. Two consumers still presented that value as current.
The metrics-history handler answered an empty disk range with the disk's
temperature as a "live" point at now, regardless of its state. Since the
history writers stopped recording retained temperatures, a short-range
chart for a silent agent's disk or a sleeping disk showed the retained
value as a fresh reading. Mock mode also seeded synthetic series from it
and padded sparse stored series out to now. All of these now require a
temperature collected now (diskinventory.TemperatureCollected, the
shared form of the rule the history writers apply).
Unraid array-inventory rows carry no per-field provenance, so a
temperature taken from one looked collected after the agent went silent.
The adapter now derives its state from the host lease that
ExpireHostTelemetry already records, and from the disk's spin state:
unavailable once the host is offline or the disk is spun down. A SMART
row that borrows the inventory reading takes that state, including
available. The native row records only the withdrawing states, because
the registry merge picks temperature and state separately and an
available claim from it would mask the SMART row's own state. A
withdrawn inventory temperature no longer counts as heat in disk risk.
A host agent that stops reporting keeps its last SMART rows in state.
The Proxmox physical-disk merge copied that agent's temperature and I/O
counters into the disk together with its "available" collection state,
the registry merged the agent's retained rows into the canonical disk the
same way, and every full disk poll wrote the frozen temperature to SMART
history as a new sample. A dead agent's disk temperatures therefore stayed
"collected" in the API and kept extending the history chart indefinitely.
Expiring the agent's reporting lease is now the point where those
readings stop being current. ExpireHostTelemetry keeps the SMART
temperature and I/O values as last-known evidence but marks them
unavailable ("host agent stopped reporting"), as the physical-disk
contract asks for retained evidence. Because MergeStatus lets any
available state win, a Proxmox disk row still holding the earlier copy
would mask that, both on skipped disk polls and when the PVE host is down
and never disk-polled again. diskinventory.MergeReportedStatus lets a
source's later word on its own field supersede the availability it
supplied earlier; the monitoring merge and both registry ingest orders
use it. Every SMART temperature history writer now records a
temperature only when its current state is collected, so a retained
reading (an agent past its lease, or a disk in standby) is not written as
a new sample.
Agents before 6.2 send no collection provenance, so their merged
temperature is recorded as collected from "host_agent" instead of
inheriting Proxmox's "unsupported", keeping their history intact.
Expiry is now compare-and-set on the report time the evaluation judged
stale, so a report accepted in between is not expired.
SMART attributes, wearout and health stay last-known on purpose: they
are durable health evidence, and dropping them would resolve disk-health
and low-life alerts when an agent goes quiet. Disk temperature alerts
are evaluated from the agent's own report, so they never read this
merged value. The node-temperature path (agent sensors feeding
node.Temperature.SMART, which the disk merge labels proxmox_node_smart)
is gated by the agent's sighting in #2582; a carried node reading can
still stamp a disk as collected and belongs to that path.
Richard Courtman