Release Notes

Important

Due to REST API version changes, to upgrade to MKE 3.9 from MKE 3.8.10 or earlier, you must first upgrade to MKE 3.8.11. Following that, you must upgrade to MCR 25.0.12 or later.

MKE 3.9.0 current

Initial MKE 3.9.0 release introducing the following key features and enhancements:

  • Introduction of Envoy Gateway Controller 1.7

  • Introduction of client bundle expiration

  • Component upgrades:

    • Kubernetes 1.34.3

    • Calico 3.31.2

    • Prometheus 3.5.0

    • Docker CLI 29.0.4

    • Docker Client 0.2.1

    • Docker REST API 1.52.0

    • Golang 1.25.7

Note

MKE 3.9.0 is Kubernetes CNCF certified. You can review the conformance test results at https://github.com/cncf/k8s-conformance/pull/4097.

Considerations

  • Upgrading to MKE 3.8.x from MKE 3.7.x can cause your containers to restart, due to the hash calculation rule that was introduced in Kubernetes 1.31. As such, Mirantis recommends that you use the phased in-place cluster upgrade method or the blue-green deployment upgrade method to avoid the simultaneous containers restarts that the automated in-place cluster upgrade method can cause to occur in all nodes.

  • Upgrading from one MKE minor version to another minor version can result in the downgrading of MKE middleware components. For more information, refer to the middleware versioning tables in the release notes of both the source and target MKE versions.