How to query the total memory available to kubernetes nodes
After a little more resarch I found (Kubernetes 1.19) kube_node_status_allocatable_memory_bytes suitable for the job.
Additionally the kube_node_status_capacity_cpu_cores could be used for the calculation of the CPU utlilisation.
Check out the official list of node metricsHere is example usage:
CPU: kube_node_status_capacity{resource="cpu", unit="core"}Memory: kube_node_status_capacity{resource="memory", unit="byte"}