WARN No appenders could be found for logger (org.apache.kafka.clients.consumer.ConsumerConfig)


During Logstash 5.2.1 boot which uses kafka input, just noticed a few warnings:

log4j:WARN No appenders could be found for logger (org.apache.kafka.clients.consumer.ConsumerConfig).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

I have found some similar issues:

but it's still unclear for me how to avoid them.
Should I create a logging.yml file? may I add a runtime arg? Could I add some config on logstash.yml? Or in log4j2.properties?

I hope you could help me.


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