title: Apache Kafka 2.0 get the consumer lag
body: <p>I use <code>Kafka 2.0.0 (Commit:3402a8361b734732)</code></p>
  
  <p>and would like to check the Kafka consumer lag on the topic for the particular group</p>
  
  <pre><code>kafka-run-class.sh kafka.tools.ConsumerOffsetChecker --topic imdb.title --zookeeper localhost:2181 --group decisionwanted
  </code></pre>
  
  <p>but it returns the following error:</p>
  
  <pre><code>Error: Could not find or load main class kafka.tools.ConsumerOffsetChecker
  </code></pre>
  
  <p>How to properly get the lag value on this Kafka version?</p>