John Roesler reassigned KAFKA-6376:

    Assignee: John Roesler

> Improve Streams metrics for skipped records
> -------------------------------------------
>                 Key: KAFKA-6376
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6376
>             Project: Kafka
>          Issue Type: Bug
>          Components: metrics, streams
>    Affects Versions: 1.0.0
>            Reporter: Matthias J. Sax
>            Assignee: John Roesler
>            Priority: Major
>              Labels: needs-kip
> Copy this from KIP-210 discussion thread:
> {quote}
> Note that currently we have two metrics for `skipped-records` on different
> levels:
> 1) on the highest level, the thread-level, we have a `skipped-records`,
> that records all the skipped records due to deserialization errors.
> 2) on the lower processor-node level, we have a
> `skippedDueToDeserializationError`, that records the skipped records on
> that specific source node due to deserialization errors.
> So you can see that 1) does not cover any other scenarios and can just be
> thought of as an aggregate of 2) across all the tasks' source nodes.
> However, there are other places that can cause a record to be dropped, for
> example:
> 1) https://issues.apache.org/jira/browse/KAFKA-5784: records could be
> dropped due to window elapsed.
> 2) KIP-210: records could be dropped on the producer side.
> 3) records could be dropped during user-customized processing on errors.
> {quote}
> [~guozhang] Not sure what you mean by "3) records could be dropped during 
> user-customized processing on errors."
> Btw: we also drop record with {{null}} key and/or value for certain DSL 
> operations. This should be included as well.

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