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Chapter 6. Deprecations and removals

This section lists features that are deprecated (still supported but planned for removal) and removed (no longer supported as of this release) in Streams for Apache Kafka 3.1. Update your implementations accordingly.

Features marked as deprecated are still functional but will be removed in a future release. Plan to update your configurations to use the recommended alternatives.

6.1. Streams for Apache Kafka
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A summary of deprecations, removals, and breaking changes for Streams for Apache Kafka 3.x.

6.1.1. Removals
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This section lists features removed in this or earlier 3.x releases.

Java 11 no longer supported

Java 11 is no longer supported. Use Java 17.

Streams for Apache Kafka 2.9 provides Long Term Support (LTS) if you must continue using Java 11. For information on the LTS terms and dates, see the Streams for Apache Kafka LTS Support Policy.

MirrorMaker 1 removed
Support for MirrorMaker 1 has been removed. From Streams for Apache Kafka 3.1, only MirrorMaker 2 is supported.
Environment variable configuration provider

The io.strimzi.kafka.EnvVarConfigProvider class is no longer available. Use org.apache.kafka.common.config.provider.EnvVarConfigProvider instead: 

config.providers.env.class=org.apache.kafka.common.config.provider.EnvVarConfigProvider
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Identity replication policy for Kafka MirrorMaker 2
The mirror-maker-2-extensions component has been removed. Use org.apache.kafka.connect.mirror.IdentityReplicationPolicy instead.

6.1.2. Breaking changes
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There are no breaking changes for Streams for Apache Kafka in this release.

6.1.3. Deprecations
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There are no deprecations for Streams for Apache Kafka in this release.

6.2. Kafka Bridge
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A summary of deprecations, removals, and breaking changes for Kafka Bridge.

6.2.1. Removals
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This section lists features removed in this or earlier 3.x releases.

Kafka Bridge span attributes

Kafka Bridge has removed the following span attributes in alignment with OpenTelemetry semantic convention updates:

  • http.method replaced by http.request.method
  • http.url replaced by url.scheme, url.path, and url.query
  • messaging.destination replaced by messaging.destination.name
  • http.status_code replaced by http.response.status_code

  • messaging.destination.kind=topic without replacement

    These changes affect distributed tracing and reflect the transition to updated OpenTelemetry conventions.

OpenAPI v2 (Swagger)
OpenAPI v2 is no longer supported, replaced by OpenAPI v3. The /openapi/v2 endpoint returns HTTP 410 Gone. Both the /openapi and /openapi/v3 endpoints return the OpenAPI v3 definition of the Kafka Bridge REST API.

6.2.2. Breaking changes
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There are no breaking changes for Kafka Bridge in this release.

6.2.3. Deprecations
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KAFKA_BRIDGE_METRICS_ENABLED
The KAFKA_BRIDGE_METRICS_ENABLED environment variable used to enable metrics for the Strimzi Kafka Bridge is now deprecated. Users who are currently using KAFKA_BRIDGE_METRICS_ENABLED should migrate to using bridge.metrics. Specifically, they should set bridge.metrics=jmxPrometheusExporter in their application.properties file to continue using Prometheus JMX Exporter.
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