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In Pega Platform 24.1.1, the Apache Kafka client version used is 3.4.0.

This client version is used for managing connections to Apache Kafka servers or clusters that serve as sources for application stream data. The documentation specifically mentions this version in the context of configuring Kafka configuration instances in the Pega Platform Data-Admin-Kafka class.

For additional context, Pega Platform can connect to Apache Kafka clusters version Proprietary information hidden or later, and for external Kafka deployments, Apache Kafka version 3.6.0 or earlier is supported.

References: Creating a Kafka configuration instance