KIP-714 & consumer lag

[nbuesing]

I know KIP-714 only requires a certain set of metrics, I was wondering if there is any plans to support lag metrics?

I have an environment where some clients are not managed by us and consumer lag metrics are more about when offsets are committed than actual lag; so it would be great if librdkafka supported these optional metrics.

kafka_clients_org_apache_kafka_consumer_fetch_manager_records_lag
kafka_clients_org_apache_kafka_consumer_fetch_manager_records_lag_avg
kafka_clients_org_apache_kafka_consumer_fetch_manager_records_lag_max