WARN The configuration *** was supplied but isn't a known config

[mirisu2]

Hi,
When I started KafkaConnect and looked at Connet pod's logs, I saw many warns like this:

2022-07-12 09:34:38,737 WARN The configuration 'group.id' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,738 WARN The configuration 'rest.advertised.port' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,738 WARN The configuration 'plugin.path' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'admin.security.protocol' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'metrics.context.connect.kafka.cluster.id' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'status.storage.replication.factor' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'offset.storage.topic' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'consumer.security.protocol' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'value.converter' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'key.converter' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,739 WARN The configuration 'consumer.client.rack' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,740 WARN The configuration 'config.storage.topic' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,740 WARN The configuration 'producer.security.protocol' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,740 WARN The configuration 'metrics.context.connect.group.id' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,740 WARN The configuration 'rest.advertised.host.name' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,740 WARN The configuration 'status.storage.topic' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,741 WARN The configuration 'rest.port' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,741 WARN The configuration 'config.storage.replication.factor' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]
2022-07-12 09:34:38,742 WARN The configuration 'offset.storage.replication.factor' was supplied but isn't a known config. (org.apache.kafka.clients.producer.ProducerConfig) [DistributedHerder-connect-1-1]

What does it mean? Is it good? Or I should start to take care?
For now configuration of Connect looks like:

---
apiVersion: kafka.strimzi.io/v1beta2
kind: KafkaConnect
metadata:
  name: data-platform
  annotations:
    strimzi.io/use-connector-resources: "true"
spec:
  version: 3.2.0
  replicas: 1
  bootstrapServers: kafka-bootstrap:9092
  metricsConfig:
    type: jmxPrometheusExporter
    valueFrom:
      configMapKeyRef:
        name: connect-metrics
        key: connect-metrics-config.yml
  config:
    group.id: connect-cluster
    offset.storage.topic: connect-cluster-offsets
    config.storage.topic: connect-cluster-configs
    status.storage.topic: connect-cluster-status
    config.storage.replication.factor: -1
    offset.storage.replication.factor: -1
    status.storage.replication.factor: -1
  logging:
    type: inline
    loggers:
      connect.root.logger.level: "INFO"

[scholzj]

This is AFAIK normal for Connect. Kafka Connect takes the configuration it gets and passes it to different components such as consumer, producer, admin client etc. And not all of them use all the options, so that results in these warnings.

[mirisu2]

@scholzj Jakob thank you for answers!

[MrSleazy]

I also stumbled upon this issue. As mentioned by @scholzj, it seems like we can 'ignore' it. Ideally it should be addressed here.