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fix(autoscaler): fail safe when no Ready node has a memory reading - #160
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With every listed node left out as not Ready, the worst-case available memory stayed at its starting value of 100 and read as no pressure.
…lets kubectl top fails outright when no listed node has metrics, so the case that reaches the guard is a silent kubelet's last figure on a node that is not Ready.
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With every node in the selector not Ready, the memory check skipped each of them and kept its starting value of 100% available, which reads as no pressure with nothing measured. It now fails safe, like any other missing reading. Found while comparing the earlier draft PR 152 with the merged NotReady fix; its other tests are already covered by the merged tests.