Helm: Upgrades, Rollbacks, and History

You upgraded kube-prometheus-stack. The upgrade failed: Pods not ready, timeout. You run helm rollback. History shows six revisions. Four of them are FAILED. You don't know which revision was the last clean state.

helm history tells you. helm get values --revision 3 retrieves the values that were working. helm rollback <release> 3 moves you back.