Memory Usage Alert Set in Kubernetes

Hello,

I am using cockroachdb cluster on GKE and I’m monitoring with prometheus and have imported this graphana dashboard https://grafana.com/grafana/dashboards/11466/

However, there are 4 types of RAM usage within the graph(RSS, goallocated,gototal,cgo allocated), therefore I’m not able to decide on which parameter there is possiblity of high RAM usage and how can I set alert on that.

Can you please guide If anyone of you have used this before?