⚠️ Important: Since 0.40 Strimzi supports only Kubernetes 1.23 and newer. Kubernetes versions 1.21 and 1.22 are no longer supported.

Main changes since 0.41.0

This release contains the following new features and improvements:

• Add support for Kafka 3.7.1
• The UseKRaft feature gate moves to GA stage and is permanently enabled without the possibility to disable it. To use KRaft (ZooKeeper-less Apache Kafka), you still need to use the strimzi.io/kraft: enabled annotation on the Kafka custom resources or migrate from an existing ZooKeeper-based cluster.
• Update the base image used by Strimzi containers from UBI8 to UBI9
• Add support for filename patterns when configuring trusted certificates
• Enhance KafkaBridge resource with consumer inactivity timeout and HTTP consumer/producer enablement.
• Add support for feature gates to User and Topic Operators
• Add support for setting publishNotReadyAddresses on services for listener types other than internal.
• Added support for configuring the quotas plugin with type strimzi or kafka in the Kafka custom resource. The Strimzi Quotas plugin version was updated to 0.3.1.

All changes can be found under the 0.42.0 milestone.

Watch out also for some notable changes, deprecations, and removals:

• The reconciliationIntervalSeconds configuration for the Topic and User Operators is deprecated, and will be removed when upgrading schemas to v1. Use reconciliationIntervalMs converting the value to milliseconds.
• Usage of Strimzi Quotas plugin version 0.2.0 is not supported, the plugin was updated to 0.3.1 and changed significantly. Additionally, from Strimzi 0.42.0 the plugin should be configured in .spec.kafka.quotas section - the configuration of the plugin inside .spec.kafka.config is ignored and should be removed.

Upgrading from Strimzi 0.41.0

See the documentation for upgrade instructions.

Upgrading from Strimzi 0.22 or earlier

Direct upgrade from Strimzi 0.22 or earlier is not supported anymore! You have to upgrade first to one of the previous versions of Strimzi. You will also need to convert the CRD resources. For more details, see the documentation.

Container images

The following container images are part of this release:

New Contributors

• @brandon-powers made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10095
• @urbandan made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10113
• @cht42 made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10228
• @ldpliu made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10199
• @daniel-axual made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10246
• @sebastiangaiser made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10263
• @hgranillo made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10275
• @Vince-Chenal made their first contribution in https://github.com/strimzi/strimzi-kafka-operator/pull/10287

All changes

• Bump main branch to 0.42.0-SNAPSHOT by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10072
• Remove the unused Entity Operator TLS sidecar configuration from the installation files, Helm Chart and docs by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10077
• [DOC] Improve the host field description to make the default value more clear by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10073
• Clean some TLS sidecar leftovers from the Entity Operator clases by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10085
• Add missing parts to the dashboards + remove leftovers by @Frawless in https://github.com/strimzi/strimzi-kafka-operator/pull/10088
• Add ContinueReconciliationOnManualRollingUpdateFailure to CHANGELOG and docs by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10089
• docs(node pools): updates from review of node pools content by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10090
• Add Skillsoft to ADOPTERS.md by @brandon-powers in https://github.com/strimzi/strimzi-kafka-operator/pull/10095
• docs(jbod): kraft: expands description for managing metadata storage by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10083
• [system test] - fix testJbodMetadataLogRelocation for >= 3.7.0 Kafka … by @see-quick in https://github.com/strimzi/strimzi-kafka-operator/pull/10093
• docs(security): updates content for securing kafka access by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10071
• Improve the role change reversal and properly revert them by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10098
• docs(refactor): moves update content to separate section by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10097
• Add Strimzi 0.41.0 to the main branch by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10100
• [performance] - TopicOperator capacity test case by @see-quick in https://github.com/strimzi/strimzi-kafka-operator/pull/10050
• Make CC port configurable in KafkaRebalanceAssemblyOperator by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10096
• Reorder the Azure CI Release pipeline to push Helm OCI at the end by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10112
• [ST] Changes to STs after release of 0.41.0 - upgrade/downgrade and default OLM version by @im-konge in https://github.com/strimzi/strimzi-kafka-operator/pull/10109
• #8732 Enhance KafkaBridge resource with consumer inactivity timeout and HTTP consumer/producer parts enablement by @steffen-karlsson in https://github.com/strimzi/strimzi-kafka-operator/pull/9820
• docs(kraft): makes the migration rollback situation clear by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10111
• Promote the UseKRaft feature gate to GA by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10106
• docs(upgrade): extracts the client update step from the kafka upgrade procedure by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10121
• Use UBI9 instead of UBI8 as a base image by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10126
• Add RF change ST tunings to make it more stable by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10116
• Update Kaniko executor to 1.23.0 by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10132
• Fix Topic Operator metrics tests by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10130
• Compute build revision in KafkaConnectAssemblyOperatorPodSetTest by @urbandan in https://github.com/strimzi/strimzi-kafka-operator/pull/10113
• [Fix] correct bridge env vars names for consumer and producer enabled by @kornys in https://github.com/strimzi/strimzi-kafka-operator/pull/10120
• Refactor handing and preparatin of trusted certificates by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10123
• docs(bridge): cleans up naming of kafka bridge by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10144
• Extract Topic Operator's Cruise Control client by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10092
• Expend feature gates support to all Strimzi operators by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10141
• [DOC] Regenerate the container images documentation snippet by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10151
• Fixed minor typo and indentation by @ppatierno in https://github.com/strimzi/strimzi-kafka-operator/pull/10152
• Assume yes when using microdnf by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10157
• Update Vert.x and related dependencies by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10156
• Minor fixes in the Entity Operator model classes by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10150
• Add support for filename patterns when configuring trusted certificates by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10147
• Fix Topic Operator's reconciliationIntervalMs type by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10158
• Update Fabric8 Kubernetes Client to 6.13 and the API specs derived from it by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10168
• Use pattern in trustedCertificates fields in examples by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10167
• Add Topic Operator's Cruise Control additional metrics by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10160
• Include only broker nodes in the NodePort bootstrap address by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10170
• [DOC] Clarify that UseKRaft being GA does not mean you have to use KRaft by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10172
• ST: Add system test for tiered-storage with Aiven plugin by @Frawless in https://github.com/strimzi/strimzi-kafka-operator/pull/10149
• Add publishNotReadyAddresses to GenericKafkaListenerConfiguration by @MichaelMorrisEst in https://github.com/strimzi/strimzi-kafka-operator/pull/10178
• Updated bridge to 0.29.0 by @ppatierno in https://github.com/strimzi/strimzi-kafka-operator/pull/10177
• Update JMX Exporter to 1.0.1 by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10184
• Deprecate reconciliationIntervalSeconds in favor of reconciliationIntervalMs by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10175
• Update the GitHub action versions to use newer NodeJS version by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10193
• [DOC] add namespace to each kafkatopic operation commands by @tgib23 in https://github.com/strimzi/strimzi-kafka-operator/pull/10194
• Introduce Helm Chart unit tests by @maciej-tatarski in https://github.com/strimzi/strimzi-kafka-operator/pull/10192
• Run Helm chart unit tests on the Azure pipeline by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10195
• ST: Update Jeager Operator in systemtests to 1.57 by @Frawless in https://github.com/strimzi/strimzi-kafka-operator/pull/10197
• Highlight migration doesn't work with one KRaft controller ephemeral storage by @ppatierno in https://github.com/strimzi/strimzi-kafka-operator/pull/10190
• docs(refactor): updates to the oauth doc following review by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10143
• [ST] Increase ZK replicas in TopicST by @im-konge in https://github.com/strimzi/strimzi-kafka-operator/pull/10200
• Update the Kind test container and remove the Etcd version override and Maven overrides by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10203
• [ST] Fix TieredStorageST.testTieredStorageWithAivenPlugin by @kornys in https://github.com/strimzi/strimzi-kafka-operator/pull/10205
• docs(tls): updates example config to show cert pattern property by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10206
• docs(reconciliation): note on ContinueReconciliationOnManualRollingUpdateFailure by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10207
• Update Kaniko to 1.23.1 by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10211
• Roll controller-only nodes when logging configuration changes by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10209
• [system test] Metrics collector test frame integration by @see-quick in https://github.com/strimzi/strimzi-kafka-operator/pull/10191
• Update Sundrio dependency to 0.200.0 by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10219
• Update the Keycloak endpoint urls in examples and documentation by @mstruk in https://github.com/strimzi/strimzi-kafka-operator/pull/10222
• Fixed warnings on potential final fields in Cruise Control related classes by @ppatierno in https://github.com/strimzi/strimzi-kafka-operator/pull/10221
• [ST] Fix Namespace issue with TieredStorageST and add base image env variable to AZP by @im-konge in https://github.com/strimzi/strimzi-kafka-operator/pull/10220
• Fix model warnings by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10226
• Fix to_bytes.gawk for memory in terabytes by @cht42 in https://github.com/strimzi/strimzi-kafka-operator/pull/10228
• Fix mirrormaker checkpoint_latency_ms metric labeling by @maciej-tatarski in https://github.com/strimzi/strimzi-kafka-operator/pull/10223
• fix filter bug in dashboards by @ldpliu in https://github.com/strimzi/strimzi-kafka-operator/pull/10199
• Make the name option forbidden for Kafka Connect connector configs by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10229
• Uncommented (and enabled by default) KRaft-related metrics in the example YAML by @ppatierno in https://github.com/strimzi/strimzi-kafka-operator/pull/10240
• Raise warnings when broker IDs in listener configs don't match the actual broker IDs by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10230
• Refactor kafkarebalance handling methods by @ppatierno in https://github.com/strimzi/strimzi-kafka-operator/pull/10232
• Improve response tracing and authorization error handling by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10208
• Add BatchingTopicController refactoring (1/3): model classes by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10196
• docs(kraft): introduces new section describing kraft by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10171
• Added DEBUG logging on the Cruise Control API client by @ppatierno in https://github.com/strimzi/strimzi-kafka-operator/pull/10239
• Auto-comment on invalid changes of released files by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10242
• Use mutable HashMap instead of immutable Map.of() in the API classes in places that should be editable by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10243
• Don't configure unused TLS sidecars in STs by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10249
• ST: Stabilize system tests on testing farm and other execution environments by @Frawless in https://github.com/strimzi/strimzi-kafka-operator/pull/10166
• Add Quotas API to Kafka CR and upgrade Strimzi Quotas Plugin to 0.3.1 by @im-konge in https://github.com/strimzi/strimzi-kafka-operator/pull/9895
• Fix the misleading log message when trying to roll pending pod by @tinaselenge in https://github.com/strimzi/strimzi-kafka-operator/pull/10244
• Collect test coverage data from unit and integration tests by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10251
• Update logging of Kafka Connect when Connector operator is disabled by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10252
• Update assembly-drain-cleaner.adoc by @daniel-axual in https://github.com/strimzi/strimzi-kafka-operator/pull/10246
• Add Cruise Control restart comment to the Topic Operator by @fvaleri in https://github.com/strimzi/strimzi-kafka-operator/pull/10259
• ST: Evenly split components systemtest profile to more closely match with execution time for operators profile by @Frawless in https://github.com/strimzi/strimzi-kafka-operator/pull/10255
• docs(refactor): moves pv recovery and FAQs to separate sections by @PaulRMellor in https://github.com/strimzi/strimzi-kafka-operator/pull/10234
• Unify different logging annotations by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10261
• Add Hetzner to adopters file by @sebastiangaiser in https://github.com/strimzi/strimzi-kafka-operator/pull/10263
• [DOC] Don't suggest that the tls flag in listener configuration has a default value by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10264
• ST: Skip TieredStorage tests on Microshift, fix race in AlternativeReconcileTriggersST by @Frawless in https://github.com/strimzi/strimzi-kafka-operator/pull/10262
• Remove ClusterRole creation from the Cluster Operator by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10265
• Simplify certificate reloading for Deployment based components by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10269
• Address some build warnings with deprecations or unchecked casts by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10270
• [helm] add kafkanodepools to RBAC AggregateRoles by @hgranillo in https://github.com/strimzi/strimzi-kafka-operator/pull/10275
• [system test] Update log for KafkaConnect when KafkaConnector is disa… by @see-quick in https://github.com/strimzi/strimzi-kafka-operator/pull/10272
• Fix pushing of artifacts to Nexus by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10282
• Fix pushing of artifacts to Nexus - Once again by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10284
• Add support for Apache Kafka 3.7.1 by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10283
• Update Helm README.md with correct default memory limits by @akatona84 in https://github.com/strimzi/strimzi-kafka-operator/pull/10286
• Add NodeIds in KafkaNodePool printer columns by @Vince-Chenal in https://github.com/strimzi/strimzi-kafka-operator/pull/10287
• Remove the JBOD storage check from KafkaRebalanceAssemblyOperator by @scholzj in https://github.com/strimzi/strimzi-kafka-operator/pull/10281
• Fixed the KafkaRebalance resource reconciliation getting stuck if CC pod is restarted during rebalance by @ShubhamRwt in https://github.com/strimzi/strimzi-kafka-operator/pull/10224