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This PR is to make Kafka consumer metrics available in Datadog so we don't have to use the weird custom ones that are managed by cs stats. (These will just be collected via JMX).
I have hand-jammed this file on prod-kafka1, so you can see these metrics appearing in datadog.
For example, go check out the kafka.consumer_lag metric with a tag equal to one of these topics:
I don't actually know how to correctly test and deploy this change.