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The runtime exposes no device-side usage counter (mvm_utilisation is a configuration limit, not a readout), so the NPU card rendered empty. ModelInstance.run blocks until the AIPU completes: the detector process now times each run and publishes busy/wall over a 2s window through a small file under the tmp cache dir; the stats poller reads it and sets the npu key. A stale file (detector idle/restarting) reports nothing rather than a stale number.