Charly Molter created KAFKA-5890:
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Summary: records.lag should use tags for topic and partition
rather than using metric name.
Key: KAFKA-5890
URL: https://issues.apache.org/jira/browse/KAFKA-5890
Project: Kafka
Issue Type: Bug
Components: clients
Affects Versions: 0.10.2.0
Reporter: Charly Molter
As part of KIP-92[1] a per partition lag metric was added.
These metrics are really useful, however in the implementation it was
implemented as a prefix to the metric name:
https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java#L1321-L1344
Usually these kind of metrics use tags and the name is constant for all topics,
partitions.
We have a custom reporter which aggregates topics/partitions together to avoid
explosion of the number of KPIs and this KPI doesn't support this as it doesn't
have tags but a complex name.
[1]
https://cwiki.apache.org/confluence/display/KAFKA/KIP-92+-+Add+per+partition+lag+metrics+to+KafkaConsumer
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