Exam Professional Cloud Architect topic 1 question 199 discussion

C. Change the filter to metric.label.state = ‘used’. The current filter is set up with multiple AND conditions, which means it's looking for a metric that simultaneously has all these states: 'used', 'buffered', 'cached', and 'slab'. This is logically impossible, as a memory location can't be in multiple states at once. Therefore, the filter will never match any metrics, and the autoscaling policy won't trigger.

I am confused since this question comes in contrast with the answer in question 190. Anyone knows what is the real answer? I would expected used+buffered+cached+slab Which means the sum of all these.

as it is clearly indicated in the public documentation https://cloud.google.com/compute/docs/autoscaler/scaling-cloud-monitoring-metrics#gcloud_5 you have change the filter to metric.label.state="used"