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Ettore Di Giacinto
f7ded96b1e
The scheduler's liveness probe asks a worker a question over NATS and reads "no responders" as proof the worker is gone. That is only sound when every worker in the fleet subscribes to the subject asked. It asked models.running, which arrived in 4.6. A 4.5 worker is alive and serving, answers backend.list, and never subscribes to models.running, so the probe condemned it on every scheduling attempt and marked it unhealthy. A model pinned to such a node by its selector could then never be placed at all: on this cluster an embedding model pinned to the one Apple node was unschedulable for exactly this reason, while that node's log showed it handling backend.list throughout. Ask backend.list, which has been in the worker protocol far longer, and treat a worker that answers anything as alive. Only a node that reports no responders on every subject is absent, so adding a newer subject here can never condemn an older worker. Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Assisted-by: Claude Code:claude-opus-5 [golangci-lint]