This is a Kubernetes Operator (https://coreos.com/operators/) to work with Ops Manager and Kubernetes clusters. It allows you to easily add new MongoDB deployments (standalones, replica sets, sharded clusters) to your Kubernetes cluster, configure them (modify, scale up/down, remove) and to manage them from your Ops Manager installation. This provides the combined power of Kubernetes (native scheduling of applications to nodes, scaling, fault tolerance etc) with Ops Manager capabilities (monitoring, backup, upgrades etc).
Please see the starting guide.