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012c25d604
Distinguish a real rebuild ("recovery" after disk replacement) from
routine maintenance ("check" data scrubs, "resync" after unclean
shutdown) using the in-progress sync action from /proc/mdstat. The
mdadm --detail State field does not reliably surface scrub state on
all kernel/distribution combinations (notably Synology DSM), which is
why scheduled scrubs were firing "RAID array is rebuilding" warnings
every 30 seconds (Fixes #1446).
The mdadm parser now extracts the operation keyword from the
/proc/mdstat progress line and surfaces it as RAIDArray.Operation
alongside the existing speed parse. The alert layer treats "recovery"
and "reshape" as rebuild signals; "check" and "resync" are treated as
maintenance and do not fire an alert. Stringy State matching is kept
as a backstop for arrays without a /proc/mdstat progress line, but
"resync" alone in State no longer counts as a rebuild signal.
Threaded the new field through the host-agent report, the resources
converter, and the monitor's models conversion. Added /proc/mdstat
parser tests covering recovery/check/resync/reshape/idle, and
end-to-end alert tests for recovery (alerts), check (silent scrub),
and resync (silent maintenance).
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