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⚠️ Important: Strimzi 0.48.0 supports only Kubernetes 1.27 and newer. Kubernetes 1.25 and 1.26 are not supported anymore

Main changes since 0.47.0

This release contains the following new features and improvements:

  • Add support for Kafka 4.1.0. Remove support for Kafka 3.9.0 and 3.9.1.
  • KRaft mode and Kafka Node Pools are now enabled by default. The strimzi.io/node-pools and strimzi.io/kraft annotations are not required anymore and will be ignored if set.
  • Make properties broker.session.timeout.ms, broker.heartbeat.interval.ms and controller.socket.timeout.ms configurable
  • Add monitoring of custom resources using kubernetes-state-metrics (KSM) (see Strimzi proposal 087)
  • Ignore users (their ACLs, Quotas and SCRAM-SHA-512 credentials) managed by some other tools based on a configurable pattern in User Operator
  • Support for type: custom client authentication (to make it easier to use custom authentication mechanisms such as AWS IAM)
  • Added support for Strimzi Metrics Reporter to Kafka Connect, Mirror Maker 2 and Kafka Bridge.
  • Add new feature gate ServerSideApplyPhase1 (disabled by default) that adds support for Server Side Apply for ConfigMap, Ingress, PVC, Service, and ServiceAccount according to Strimzi Proposal [#105].
  • Added distinction between changes of "cluster-wide" broker properties applied dynamically at cluster level, and "per-broker" broker properties applied dynamically at broker level.
  • Extend the EntityOperator, Cruise Control and KafkaExporter deployment to support PDB via the template section in the CR spec.
  • Added support for KIP-1073 to get the list of the registered brokers by using the Kafka Admin API. It replaces the usage of the .status.registeredNodeIds field in Kafka.
  • Added support for KIP-745 in Kafka Connector and Mirror Maker 2, allowing the usage of includeTasks and onlyFailed arguments in Kafka connectors restart.
  • Update OAuth library to 0.17.0.
  • Additional OAuth configuration options have been added for 'oauth' authentication on the listener and the client. On the listener clientGrantType has been added. On the client grantType has been added.

Major changes, deprecations and removals

  • Fix RBAC naming for KafkaMirrorMaker2 to avoid RoleBinding collisions when a KafkaConnect with the same name exists in the same namespace. KafkaMirrorMaker2 now uses dedicated RoleBinding names.

Upgrade note for KafkaMirrorMaker2 users (0.47.0 → 0.48.0+): Cleanup recommended

After upgrading the operator, a new (dedicated) RoleBinding for KafkaMirrorMaker2 will be created and used automatically. The old RoleBinding, if it exists, may remain in the cluster but is no longer referenced.

```bash
# List RoleBindings for your KafkaMirrorMaker2 instance (replace <namespace> and <mm2-name>)
kubectl get rolebindings -n <namespace> \
  -l strimzi.io/kind=KafkaMirrorMaker2,strimzi.io/cluster=<mm2-name>
```

If multiple RoleBindings are shown, the legacy one is <mm2-name>-connect-connect-role and the new one is <mm2-name>-mirrormaker2-role.

You can safely delete just the legacy RoleBinding (unused after upgrade):

```bash
kubectl delete rolebinding -n <namespace> <mm2-name>-connect-connect-role
```
  • From Strimzi 0.48.0 on, we support only Kubernetes 1.27 and newer. Kubernetes 1.25 and 1.26 are not supported anymore.
  • Disable Cruise Control network resource goals when resource capacities are not set.
  • The strimzi_resource_state metric in the Cluster Operator is deprecated and is planned to be removed in Strimzi 0.51. Use kube-state-metrics based metrics from the examples as a replacement.
  • The field .spec.enableMetrics in KafkaBridge is now deprecated and replaced by .spec.metricsConfig.
  • The User Operator does not ignore the ACL rules for the * and ANONYMOUS users by default anymore. If you need to re-enable this feature, you can do it by configuring the STRIMZI_IGNORED_USERS_PATTERN environment variable to the following regular expression: ^\*|ANONYMOUS$. In case you deployed the User Operator through a Kafka custom resource, you can set it using the following YAML directly in the Kafka CR: yaml apiVersion: kafka.strimzi.io/v1beta2 kind: Kafka spec: #... entityOperator: template: userOperatorContainer: env: - name: STRIMZI_IGNORED_USERS_PATTERN value: "^\\*|ANONYMOUS$" # Double \ needed for escaping #... In case you use the standalone User Operator, you can set the environment variable in its Deployment. Please keep in mind that the ignored users will apply not only to ACLs, but also to Quotas and SCRAM-SHA credentials.
  • The field .status.registeredNodeIds in Kafka is now deprecated, it is not used anymore, and it will be removed in the future.

All changes can be found under the 0.48.0 milestone.

Maven artifacts

To test the Maven artifacts that are part of this release, use the 0.48.0 version in your pom.xml.

Upgrading from Strimzi 0.47.0

See the documentation for upgrade instructions.

Container images

The following container images are part of this release:

Name Image
Operators quay.io/strimzi/operator@sha256:73dc9555c4a73094b497ffb14d816de5ff40144ffc470efd75ccf128afa22778
Apache Kafka 4.0.0 quay.io/strimzi/kafka@sha256:48db05ad2e9fa39eb388089e7e25654bcbf4da1ddc3a5635d675056c28bbcb96
Apache Kafka 4.1.0 quay.io/strimzi/kafka@sha256:34450afc1a3399a9026fc3c6ec90e9f6adfec9faf6520545b4d84e90cda34964
Strimzi Bridge quay.io/strimzi/kafka-bridge@sha256:53034f64f0b672f10b5bacea1c7a25132f118df7fd5c9032c4dbf702ed93796a
Kaniko executor quay.io/strimzi/kaniko-executor@sha256:a5088c14d7b8bf1d336669cba047b971bf3ece8969647dae2c1e3a07a7be0c5e
Maven Builder quay.io/strimzi/maven-builder@sha256:64380efcb8da87fdc0e0de238a20456be9abb830174c2f2331882b7a84657e57

New Contributors

What's Changed

Full Changelog: https://github.com/strimzi/strimzi-kafka-operator/compare/0.47.0...0.48.0

Source: README.md, updated 2025-09-24