Running k8s cluster on AWS. Want to use a monitoring tool to do monitoring and alerting. The most famous one is Prometheus. But the k8s official suggests Heapster. Which is better? And why?
There is no better or worse here, you need both :)
Heapster is a solution that makes it possible for Prometheus to collect metrics for the kube cluster. It is also intended to be replaced by Metrics Server eventually. Heapster will also allow things like kubectl top pods to work, but will not give you a long term metrics storage / analysis / alerting. For that, you need something like Prometheus+Grafana.