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Anso
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* fix(metrics): host memory usage excludes reclaimable page cache Host RAM was computed as mem.used / mem.total via systeminformation, but mem.used counts reclaimable buffers/cache as used, so a busy Linux host read ~99%. Switch the dashboard stats, the fleet node self-report, and the host-RAM alert threshold to mem.active / mem.total (cache-excluded), and report used: mem.active and free: mem.available so the byte readout stays consistent with the percentage. Add regression tests for a cache-heavy host (no false alert) and a genuinely busy host (alert still fires). * test(metrics): assert system stats memory excludes reclaimable cache The cached /api/system/stats test mocked si.mem() without active/available, so after the route switched to the cache-excluded fields it produced a NaN percentage that the shape-only assertions did not catch. Fill the mock with a realistic shape and assert the route reports the active working set, not the cache-inclusive used/free.