# Open Cluster Management v0.16.0

> Orchestration & Management · 2025-03-13

A feature-rich release centered on AWS registration, IRSA, importing, and add-on support, with API, default, dependency, and correctness updates. Breaking behavior and configuration changes affect lifecycle annotations, management defaults, leader election, and ARN pattern formatting.

## Action needed
- **[breaking]** The `cma` lifecycle annotation and `addon-manager` ownership
  - This breaking change removes the lifecycle annotation from `cma` and makes it managed by `addon-manager`.
- **[breaking]** The AWS CLI Docker image
  - The AWS CLI Docker image is removed from the release.
- **[breaking]** The `cluster-manager` resource limit
  - The resource limit for `cluster-manager` is removed.
- **[breaking]** ManagedClusterSet webhook registration
  - ManagedClusterSet webhook registration is removed.
- **[breaking]** The `cluster-manager` resource limit
  - The resource limit for `cluster-manager` is removed.
- **[breaking]** The `klusterlet operator` replica count
  - The default replica count for the `klusterlet operator` is changed to one.
- **[breaking]** The `cma` lifecycle annotation and `addon-manager` ownership
  - This breaking change removes the lifecycle annotation from `cma` and makes it managed by `addon-manager`.

## Check if affected
- **[breaking]** `klusterlet-agent` leader election on single-node management clusters
  - Applies if `klusterlet-agent` runs on a single-node management cluster.
  - Leader election for `klusterlet-agent` on a single-node management cluster is reverted.
- **[breaking]** The `ARN pattern` format
  - Applies if you configure `ARN pattern`.
  - The ARN pattern format changes from a string enclosed in square brackets to a comma-separated string.

## Other recorded changes
- 171 (value_changed 55, added 50, defect_corrected 43, constraint_changed 12, renamed 5, default_changed 4, removed 2)

[Full analysis](https://ratatosk.io/en/releases/open-cluster-management/v0.16.0)

[Original release notes](https://github.com/open-cluster-management-io/ocm/releases/tag/v0.16.0)