This section outlines new features implemented in the Cluster release 11.2.0 that is introduced in the Container Cloud release 2.18.0.

MKE and MCR version update

Updated the Mirantis Kubernetes Engine (MKE) version from 3.5.1 to 3.5.3 and the Mirantis Container Runtime (MCR) version from 20.10.8 to 20.10.11 for the Container Cloud management, regional, and managed clusters on all supported cloud providers, as well as for non Container Cloud based MKE cluster attachment.

Elasticsearch switch to OpenSearch

As part of the Elasticsearch switching to OpenSearch, removed the Elasticsearch and Kibana services, as well as introduced a set of new parameters that will replace the current ones in future releases. The old parameters are supported and take precedence over the new ones. For details, see Deprecation notes and StackLight configuration parameters.


In the Container Cloud web UI, the Elasticsearch and Kibana naming is still present. However, the services behind them have switched to OpenSearch and OpenSearch Dashboards.

Improvements to StackLight alerting

Implemented the following improvements to StackLight alerting:

  • Added the MCCClusterUpdating informational alert that raises when the Mirantis Container Cloud cluster starts updating.

  • Enhanced StackLight alerting by clarifying alert severity levels. Switched all Minor alerts to Warning. Now, only alerts of the following severities exist: informational, warning, major, and critical.

  • Enhanced the documentation by adding troubleshooting guidelines for the Kubernetes applications, resources, and storage alerts.

Prometheus remote write

Implemented the capability to allow sending of metrics from Prometheus, using the Prometheus remote write feature to a custom monitoring endpoint.

StackLight mandatory parameters

Defined the following parameters in the StackLight configuration of the Cluster object for all types of clusters as mandatory. This applies to the clusters with StackLight enabled only. For existing clusters, Cluster object will be updated automatically.


When creating a new cluster, specify these parameters through the Container Cloud web UI or as described in StackLight configuration parameters. Update all cluster templates created before Container Cloud 2.18.0 that do not have values for these parameters specified. Otherwise, the admission controller will reject cluster creation.

Web UI parameter

API parameter

Enable Logging


HA Mode


Prometheus Persistent Volume Claim Size


Elasticsearch Persistent Volume Claim Size


Ceph daemons placement

Implemented the capability to configure the placement of the rook-ceph-operator, rook-discover, and csi-rbdplugin Ceph daemons.