Add required metrics for asserts

[petewall]

The only one missing from the hard-prerequisites is:

• container_memory_usage_bytes

Asserts requirements: https://grafana.com/docs/grafana-cloud/monitor-applications/asserts/get-started/prerequisites-troubleshooting/#kubernetes-metrics

Current k8s-monitoring allow lists:

• kube-state-metrics
• cadvisor
• kubelet
• kubelet resource
• node exporter