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Sanaei
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Node I/O on the traffic-accounting path must never stall accounting; the
serial writer states it ("Keep network I/O (node pushes) OUT of fn").
AddTraffic still applied the depletion UpdateInbound for every node
inbound inside the writer closure, one at a time with context.Background.
One hanging node held the single writer for each push, freezing traffic
polls, node snapshot merges and every client edit for the whole wave; a
client shared by 150 nodes expiring could hold it for tens of minutes.
The opt-in restart on client disable then ran node by node on the same
traffic job.
Remote plans now leave the writer and go through nodePushPlan and the 4s
nodePushContext, fanned out like client pushes: an offline or slow node
defers to the reconcile its dirty flag already schedules. The node restart
runs in its own goroutine, since nothing replays or waits on it.
TestTrafficDisableImmediatelyUpdatesNodeRuntime called addTrafficLocked
directly, which pinned the push inside the writer; it now calls AddTraffic
and still requires the push to have landed on return.