Namespace Org.Apache.Kafka.Security Classes CredentialProvider https://www.javadoc.io/doc/org.apache.kafka/kafka-server-common/4.2.1/org/apache/kafka/security/CredentialProvider.html DelegationTokenManager https://www.javadoc.io/doc/org.apache.kafka/kafka-server-common/4.2.1/org/apache/kafka/security/DelegationTokenManager.html