1) Current `lateRecordDropSensor` seems to be completely paired with 
`recordLatenessSensor`, i.e. there is no place where we only record one of them 
but not both. It makes me thinking if we can optimize this a bit to get one 
sensor, with a COUNT / and AVG / MAX metrics with it, as it seems that 
`lateRecordDropSensor` is just a COUNT of the `recordLatenessSensor`.

2) I'm also a bit concerned about the performance as it is a per 
task-processor-node-level sensor. Would better consider doing KAFKA-7275 sooner 
than later.

[ Full content available at: https://github.com/apache/kafka/pull/5742 ]
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