Minor Description
The "metric.reporters" configuration key should be consistent with the actual classes. Clients have a MetricsReporter.class while the broker has a KafkaMetricsReporter.class.
We have seen quite a few people configure this field incorrectly by setting it as "metrics.reporters".
The configuration key could be renamed to "metrics.reporters" to match the classes, or the classes can be renamed to MetricReporter.class and KafkaMetricReporter.class.
The broker configuration description for "metric.reporters" also mentions MetricReporter, but KafkaMetricsReporter is the actual interface to implement.
There also seems to be a discrepancy with "MetricReporter" in the description as the class name is actually "MetricsReporter". https://github.com/apache/kafka/pull/3875