Jun Rao created KAFKA-6184:
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Summary: report a metric of the lag between the consumer offset
and the start offset of the log
Key: KAFKA-6184
URL: https://issues.apache.org/jira/browse/KAFKA-6184
Project: Kafka
Issue Type: Improvement
Affects Versions: 1.0.0
Reporter: Jun Rao
Currently, the consumer reports a metric of the lag between the high watermark
of a log and the consumer offset. It will be useful to report a similar lag
metric between the consumer offset and the start offset of the log. If this
latter lag gets close to 0, it's an indication that the consumer may lose data
soon.
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