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We only have one tool with this issue (kafka.tools.StateChangeLogMerger), which is tracked in KAFKA-7735. This tool has been broken since 2.0 release, so it means that there is not much interest and we should simply deprecate.
However, the work for migrating and fixing this tool is on-going, but not included in the scope of this KIP.
Core dependency
Most tools communicate via Kafka protocol by using client classes, so they can be migrated without dependencies on core. Instead, tools with non-trivial dependencies on core (e.g. log message parsers) should wait until all required dependencies are migrated. If present, we should set related tasks as blockers for the tool migration sub-task.
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