How to alert on the Kubernetes Cluster health?
<p>We are running as hosted Kubernetes cluster on Google Cloud (GKE) and scraping it with Prometheus.</p>

<p>My Question is similar to <a href="https://stackoverflow.com/questions/39349744/kubernetes-prometheus-metrics-for-running-pods-and-nodes">this</a> one, but I'd like to know what are the most important metrics to look out for in the K8s Cluster and possibly alert on?</p>

<p>This is rather a K8s then a Prometheus question, but I'd really appreciate some hints. Please let me know if my question is to vague, so I can refine it.</p>