While deletion of a deployment is possible via Kubernetes, deleting a MongoDB resource doesn’t remove it from the Ops Manager UI. You must remove the resource from Ops Manager manually. To learn more, see Remove a Process from Monitoring ( https://www.mongodb.com/docs/ops-manager/current/tutorial/remove-process-from-monitoring/ ).
Deleting a MongoDB resource for which you enabled backup doesn’t delete the resource’s snapshots. You must delete snapshots in Ops Manager ( https://www.mongodb.com/docs/ops-manager/current/tutorial/delete-backup-snapshots/ ).
Find out more ( https://www.mongodb.com/docs/kubernetes-operator/master/reference/troubleshooting/#remove-k8s-components ).
Work is planned to remove Ops Manager as a prerequisite (though it's use will still be optional and supported) and as part of that we hope to address this deletion aspect.