I think this link will help: https://github.com/kubernetes/kubernetes/blob/master/test/instrumentation/documentation/documentation.md
I found it while reading the K8 docs about Metrics For Kubernetes System Components: https://kubernetes.io/docs/concepts/cluster-administration/system-metrics/
At the end of the page they provided some links, one of them directed me to a github repo where I did some exploration and stumbled across the link mentioned above. I hope that helps.