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rcourtman
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A review of the previous commit found three ways the node and its linked agent could still disagree about who alerts. Memory ownership required a known reading on every report. When an agent's memory reading went missing while its alert was open, the agent kept that alert (a missing reading is not a recovery) but stopped owning memory, so the node raised a second alert. It resolved again as soon as the reading returned, with history and notifications for each flip. Ownership now follows the agent's configured thresholds, not one report's data. With several agents linked to one node, only the lowest agent ID's coverage counted. If that agent had CPU off and another linked agent evaluated CPU, the node alerted on CPU as well. A metric is now owned when any linked agent evaluates it. Disk ownership needed any evaluated filesystem, but a linked node's disk metric is the agent's summary filesystem (root when reported, see models.SummaryDisk). With root disabled by a per-disk override and /data still alerting, the node gave up its root disk alert and a full root filesystem raised nothing. The agent now owns the node's disk metric only while it evaluates that same filesystem.