Hi

Maybe this helps

https://cwiki.apache.org/confluence/display/KAFKA/Clients says https://github.com/edenhill/librdkafka which is

https://metacpan.org/pod/distribution/Kafka-Librd/bin/kafka_consumer.pl

cpan finds Net::Kafka This module provides Perl bindings to librdkafka C client library. It is heavily inspired by Kafka::Librd module originally developed by Pavel Shaydo.

which says read https://github.com/edenhill/librdkafka/blob/master/CONFIGURATION.md

builtin.features tells you if you got ssl support ... bunch of other "ssl" options documented

...
ssl.key.location     *             low     Path to client's private ke
+y (PEM) used for authentication.
Type: string
ssl.key.password     *             low     Private key passphrase (for
+ use with ssl.key.location and set_ssl_cert())
...
[download]

Some of them look familiar from kafka_consumer.pl