title: Kafka log level adjust with yaml file
body: <p>I'm running Kafka in a Kubernetes environment. 
  I want to adjust kafka log level to <code>WARN</code>.  I have a yaml file which I used with <code>helm install</code>.
  In that yaml, there is a <code>envOverrides</code> parameter. Can I just add the following? And then <code>kubectl apply</code>? </p>
  
  <p>Before: </p>
  
  <pre><code>envOverrides: {}
  
  </code></pre>
  
  <p>After: </p>
  
  <pre><code># Do I need { } ? 
  envOverrides:
    kafka.log4j.root.loglevel: WARN
    kafka.log4j.loggers: "kafka.controller=WARN,kafka.producer.async.DefaultEventHandler=WARN,state.change.logger=WARN"
  </code></pre>