Description of problem:

-Kafka: SSL handshake failed: Disconnected: connecting to a PLAINTEXT broker listener while using Vector as a Collector.

-Experiencing this issue with Logging 5.9.z
-Log Forwarding to Kafka destination is working fine when using Fluentd as a collector, but it is not working with Vector as a collector.

Version-Release number of selected component (if applicable):

How reproducible:

It can be reproduced:

Steps to Reproduce:

1. Install RHOCP Cluster.
2. Install Cluster Logging Operator 5.9.z
3. Create a ClusterLogging instance using Vector as a collector.
4. Create a secret and a CLF instance with Kafka brokers:

   apiVersion: logging.openshift.io/v1
   kind: ClusterLogForwarder
   metadata:
     name: instance
     namespace: openshift-logging
   spec:
     outputs:
       - name: kafka-infra
         type: kafka
         secret:
           name: kafka-vector
         kafka:
           brokers:
             - tcp://XXXXX1:9092/9093
             - tcp://XXXXX2:9092/9093
             - tcp://XXXXX3:9092/9093
           topic: topic-logging-infra
     pipelines:
       - name: kafka-broker-1
         inputRefs:
           - infrastructure
         outputRefs:
           - kafka-infra
   

5. Error in the collector pod logs:

   YYYY-MM-DDTHH:MM:SS.XXXXZ ERROR librdkafka: librdkafka: FAIL [thrd:ssl://10.x.y.z:9093/bootstrap]: ssl://XXXXX1:909X/bootstrap: SSL handshake failed: Disconnected: connecting to a PLAINTEXT broker listener? (after 100ms in state SSL_HANDSHAKE, 1 identical error(s) suppressed)
   YYYY-MM-DDTHH:MM:SS.XXXXZ ERROR rdkafka::client: librdkafka: Global error: BrokerTransportFailure (Local: Broker transport failure): sasl_ssl://XXXXX1:909X/bootstrap: SSL handshake failed: Disconnected: connecting to a PLAINTEXT broker listener? (after 101ms in state SSL_HANDSHAKE, 1 identical error(s) suppressed)
   

Actual results:

-Unable to forward logs to Kafka brokers when using Vector as a collector.
-Tried with a single Kafka broker as well, but received same error logs.

Expected results:

-Logs need to be forwarded to External Kafka brokers.

Additional info:

• Secret was updated with SASL authentication and PLAINTEXT, but it did not help.

    username: admin
    password: 'password'
    sasl.enable: 'true'
    security.protocol: 'SASL_PLAINTEXT'
  

• Tried with a single Kafka broker as well, but received the same error logs.
• Issue persists only when using Vector as a collector.
• Broker is configured to accept the SSL Connection on the correct port.