# Monitoring a cluster

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/amazon-msk-developer-guide.git)
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## Amazon MSK metrics for monitoring with CloudWatch

* **Important**\
  For an Amazon MSK cluster that uses Apache Kafka 2.4.1 or a newer version, the metrics in the following table appear only after their values become nonzero for the first time. For example, to see `BytesInPerSec`, one or more producers must first send data to the cluster.

## Consumer-lag monitoring

* **Note**\
  To turn on consumer-lag monitoring for a cluster that was created before November 23, 2020, ensure that the cluster is running Apache Kafka 2.2.1 or a later version, then [create a support case](https://console.aws.amazon.com/support/home#/).


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